Method and substrate for performing multiple sequential reactions on a matrix

Claim 1

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of an undifferentiated substrate comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser at least one microdrop of a first reagent in liquid form to a loci on said surface, wherein said undifferentiated substrate is a porous material comprising a sheet having internal straight, essentially parallel pores, and is chemically prepared to react with said first reagent to covalently attach said reagent to said undifferentiated substrate; (b) displacing said multiple jet reagent dispenser relative to said surface, or the surface with respect to said multiple jet reagent dispenser, and applying at least one microdrop containing either the first reagent or a second reagent from a different dispenser jet to a second loci on said surface wherein said substrate is chemically prepared to react with said reagent to covalently attach said reagent to said substrate; (c) optionally repeating step (b) at least one time using either said first reagent, said second reagent, or different reagents in liquid form from different dispenser jets wherein each of said reagents covalently attaches to said substrate to form covalently attached compounds; (d) washing said substrate to remove unattached reagents; (e) modifying said attached reagents; (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of different chemical compounds at each of at least 20 said loci is completed; and (g) optionally removing the attached compounds at said loci from said substrate, wherein said optional removing is performed in a selective or a non-selective manner.

Claim 2

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of an undifferentiated substrate comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser at least one microdrop of a first reagent in liquid form to a loci on said surface, wherein said undifferentiated substrate is a porous material comprising a sheet having internal straight, essentially parallel pores, and is chemically prepared to react with said first reagent to covalently attach said reagent to said undifferentiated substrate; (b) displacing said multiple jet reagent dispenser relative to said surface, or the surface with respect to said multiple jet reagent dispenser, and applying at least one microdrop containing either the first reagent or a second reagent from a different dispenser jet to a second loci on said surface wherein said substrate is chemically prepared to react with said reagent to covalently attach said reagent to said substrate; (c) optionally repeating step (b) at least one time using either said first reagent, said second reagent, or different reagents in liquid form from different dispenser jets wherein each of said reagents covalently attaches to said substrate to form covalently attached compounds; (d) washing said substrate to remove unattached reagents; (e) modifying said attached reagents; (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of different chemical compounds at each of at least 20 said loci is completed; and (g) optionally removing the attached compounds at said loci from said substrate, wherein said optional removing is performed in a selective or a non-selective manner.

Claim 3

A method of step-by-step synthesis of an array of different chemical compounds at discrete microdrop-sized loci, where each compound is covalently attached to or beneath the surface of an undifferentiated substrate comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser at least one microdrop of a first reagent in liquid form to said surface of said undifferentiated substrate at the first locus, wherein said substrate is a porous material comprising a sheet having internal straight, essentially parallel pores; (b) displacing the multiple jet reagent dispenser relative to said surface and applying through a second jet of said multiple jet reagent dispenser a second reagent to the first locus to form a mixture of reagents at the first locus wherein said substrate is chemically prepared to react with said mixture to covalently attach one or more of said reagents to said substrate at the first locus; (c) optionally repeating steps (a) and (b) at additional microdrop sized loci of said surface where the same mixture of reagents or a different mixture of reagents are formed at each locus, wherein said reagent is dispensed from a different jet of said multiple jet reagent dispenser; (d) washing said substrate to remove the excess reagents; (e) modifying said attached reagents; (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of different chemical compounds at each of at least 20 said loci is completed; and (g) optionally removing the attached compounds at said loci from said substrate, wherein said optional removing is performed in a selective or a non-selective manner.

Claim 4

A method of step-by-step synthesis of an array of different chemical compounds at discrete microdrop-sized loci, where each compound is covalently attached to or beneath the surface of an undifferentiated substrate comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser at least one microdrop of a first reagent in liquid form to said surface of said undifferentiated substrate at the first locus, wherein said substrate is a porous material comprising a sheet having internal straight, essentially parallel pores; (b) displacing the multiple jet reagent dispenser relative to said surface and applying through a second jet of said multiple jet reagent dispenser a second reagent to the first locus to form a mixture of reagents at the first locus wherein said substrate is chemically prepared to react with said mixture to covalently attach one or more of said reagents to said substrate at the first locus; (c) optionally repeating steps (a) and (b) at additional microdrop sized loci of said surface where the same mixture of reagents or a different mixture of reagents are formed at each locus, wherein said reagent is dispensed from a different jet of said multiple jet reagent dispenser; (d) washing said substrate to remove the excess reagents; (e) modifying said attached reagents; (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of different chemical compounds at each of at least 20 said loci is completed; and (g) optionally removing the attached compounds at said loci from said substrate, wherein said optional removing is performed in a selective or a non-selective manner.

Claim 6

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of an undifferentiated substrate, wherein said substrate comprises a porous material, comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser at least one microdrop of a first reagent in liquid form to a loci on said surface, wherein said undifferentiated substrate is chemically prepared to react with said first reagent to covalently attach said reagent to said undifferentiated substrate; (b) displacing said multiple jet reagent dispenser relative to said surface, or the surface with respect to said multiple jet reagent dispenser, and applying at least one microdrop containing either the first reagent or a second reagent from a different dispenser jet to a second loci on said surface wherein said substrate is chemically prepared to react with said reagent to covalently attach said reagent to said substrate; (c) optionally repeating step (b) at least one time using either said first reagent, said second reagent, or different reagents in liquid form from different dispenser jets wherein each of said reagents covalently attaches to said substrate to form covalently attached compounds, and wherein said reagents in said microdrops comprise protected or unprotected amino acids, thereby forming polypeptides attached at said loci; (d) washing said substrate to remove unattached reagents; (e) modifying said attached reagents; (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of polypeptides at each of at least 20 said loci is completed; and (g) optionally removing the attached compounds at said loci from said substrate, wherein said optional removing is performed in a selective or a non-selective manner.

Claim 7

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of an undifferentiated substrate, wherein said substrate comprises a porous material, comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser at least one microdrop of a first reagent in liquid form to a loci on said surface, wherein said undifferentiated substrate is chemically prepared to react with said first reagent to covalently attach said reagent to said undifferentiated substrate; (b) displacing said multiple jet reagent dispenser relative to said surface, or the surface with respect to said multiple jet reagent dispenser, and applying at least one microdrop containing either the first reagent or a second reagent from a different dispenser jet to a second loci on said surface wherein said substrate is chemically prepared to react with said reagent to covalently attach said reagent to said substrate; (c) optionally repeating step (b) at least one time using either said first reagent, said second reagent, or different reagents in liquid form from different dispenser jets wherein each of said reagents covalently attaches to said substrate to form covalently attached compounds, and wherein said reagents in said microdrops comprise protected or unprotected amino acids, thereby forming polypeptides attached at said loci; (d) washing said substrate to remove unattached reagents; (e) modifying said attached reagents; (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of polypeptides at each of at least 20 said loci is completed; and (g) optionally removing the attached compounds at said loci from said substrate, wherein said optional removing is performed in a selective or a non-selective manner.

Claim 8

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of an undifferentiated substrate, wherein said substrate comprises a porous material comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser at least one microdrop of a first reagent in liquid form to said surface at the first locus of said undifferentiated substrate; (b) displacing the multiple jet reagent dispenser relative to said surface and applying through a second jet of said multiple jet reagent dispenser a second reagent to the first locus of said undifferentiated substrate to form a mixture of reagents at the first locus wherein said undifferentiated substrate is chemically prepared to react with said mixture to covalently attach one or more of said reagents to said undifferentiated substrate at the fist locus; (c) optionally repeating steps (a) and (b) at additional microdrop sized loci of said surface where the same mixture of reagents or a different mixture of reagents are formed at each locus, wherein said reagent is dispensed from a different jet of said multiple jet reagent dispenser, and wherein said reagents in said microdrops comprise protected or unprotected amino acids, thereby forming polypeptides attached at said loci; (d) washing said substrate to remove the excess reagents; (e) modifying said attached reagents; (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of polypeptides at each of at least 20 said loci is completed; and (g) optionally removing the attached compounds at said loci from said substrate, wherein said optional removing is performed in a selective or a non-selective manner.

Claim 9

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of an undifferentiated substrate, wherein said substrate comprises a porous material comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser at least one microdrop of a first reagent in liquid form to said surface at the first locus of said undifferentiated substrate; (b) displacing the multiple jet reagent dispenser relative to said surface and applying through a second jet of said multiple jet reagent dispenser a second reagent to the first locus of said undifferentiated substrate to form a mixture of reagents at the first locus wherein said undifferentiated substrate is chemically prepared to react with said mixture to covalently attach one or more of said reagents to said undifferentiated substrate at the fist locus; (c) optionally repeating steps (a) and (b) at additional microdrop sized loci of said surface where the same mixture of reagents or a different mixture of reagents are formed at each locus, wherein said reagent is dispensed from a different jet of said multiple jet reagent dispenser, and wherein said reagents in said microdrops comprise protected or unprotected amino acids, thereby forming polypeptides attached at said loci; (d) washing said substrate to remove the excess reagents; (e) modifying said attached reagents; (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of polypeptides at each of at least 20 said loci is completed; and (g) optionally removing the attached compounds at said loci from said substrate, wherein said optional removing is performed in a selective or a non-selective manner.

Claim 12

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of a substrate, wherein said substrate comprises a porous material, comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser at least one microdrop of a first reagent in liquid form to a loci on said surface, wherein said substrate is chemically prepared to react with said first reagent to covalently attach said reagent to said substrate; (b) displacing said multiple jet reagent dispenser relative to said surface, or the surface with respect to said multiple jet reagent dispenser, and applying at least one microdrop containing either the first reagent or a second reagent from a different dispenser jet to a second loci on said surface wherein said substrate is chemically prepared to react with said reagent to covalently attach said reagent to said substrate; (c) optionally repeating step (b) at least one time using either said first reagent, said second reagent, or different reagents in liquid form from different dispenser jets wherein each of said reagents covalently attaches to said substrate to form covalently attached compounds, and wherein said reagents in said microdrops comprise protected or unprotected nucleotides, thereby forming oligonucleotides attached at said loci; (d) washing said substrate to remove unattached reagents; (e) modifying said attached reagents; (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of oligonucleotides at each of at least 20 said loci is completed; (g) optionally removing the attached compounds at said loci from said substrate, wherein said optional removing is performed in a selective or a non-selective manner, then amplifying said oligonucleotides by polymerase chain reaction amplification.

Claim 13

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of a substrate, wherein said substrate comprises a porous material, comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser at least one microdrop of a first reagent in liquid form to a loci on said surface, wherein said substrate is chemically prepared to react with said first reagent to covalently attach said reagent to said substrate; (b) displacing said multiple jet reagent dispenser relative to said surface, or the surface with respect to said multiple jet reagent dispenser, and applying at least one microdrop containing either the first reagent or a second reagent from a different dispenser jet to a second loci on said surface wherein said substrate is chemically prepared to react with said reagent to covalently attach said reagent to said substrate; (c) optionally repeating step (b) at least one time using either said first reagent, said second reagent, or different reagents in liquid form from different dispenser jets wherein each of said reagents covalently attaches to said substrate to form covalently attached compounds, and wherein said reagents in said microdrops comprise protected or unprotected nucleotides, thereby forming oligonucleotides attached at said loci; (d) washing said substrate to remove unattached reagents; (e) modifying said attached reagents; (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of oligonucleotides at each of at least 20 said loci is completed; (g) optionally removing the attached compounds at said loci from said substrate, wherein said optional removing is performed in a selective or a non-selective manner, then amplifying said oligonucleotides by polymerase chain reaction amplification.

Claim 14

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of a substrate, wherein said substrate comprises a porous material, comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser at least one microdrop of a first reagent in liquid form to said surface at the first locus; (b) displacing the multiple jet reagent dispenser relative to said surface and applying through a second jet of said multiple jet reagent dispenser a second reagent in the first locus to form a mixture of reagents at the first locus wherein said substrate is chemically prepared to react with said mixture to covalently attach one or more of said reagents to said substrate at the first locus; (c) optionally repeating steps (a) and (b) at additional microdrop sized loci of said surface where the same mixture of reagents or a different mixture of reagents are formed at each locus, wherein each reagent is dispensed from a different jet of said multiple jet reagent dispenser, and wherein said reagents in said microdrops comprise protected or unprotected nucleotides, thereby forming oligonucleotides attached at said loci; (d) washing said substrate to remove the excess reagents; (e) modifying said attached reagents; (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of oligonucleotides at each of at least 20 said loci is completed; (g) optionally removing the attached compounds at said loci from said substrate, wherein said optional removing is performed in a selective or a non selective manner, then amplifying said oligonucleotides by polymerase chain reaction amplification.

Claim 15

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of a substrate, wherein said substrate comprises a porous material, comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser at least one microdrop of a first reagent in liquid form to said surface at the first locus; (b) displacing the multiple jet reagent dispenser relative to said surface and applying through a second jet of said multiple jet reagent dispenser a second reagent in the first locus to form a mixture of reagents at the first locus wherein said substrate is chemically prepared to react with said mixture to covalently attach one or more of said reagents to said substrate at the first locus; (c) optionally repeating steps (a) and (b) at additional microdrop sized loci of said surface where the same mixture of reagents or a different mixture of reagents are formed at each locus, wherein each reagent is dispensed from a different jet of said multiple jet reagent dispenser, and wherein said reagents in said microdrops comprise protected or unprotected nucleotides, thereby forming oligonucleotides attached at said loci; (d) washing said substrate to remove the excess reagents; (e) modifying said attached reagents; (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of oligonucleotides at each of at least 20 said loci is completed; (g) optionally removing the attached compounds at said loci from said substrate, wherein said optional removing is performed in a selective or a non selective manner, then amplifying said oligonucleotides by polymerase chain reaction amplification.

Claim 18

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of a substrate, wherein said substrate comprises a porous material comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser at least one microdrop of a first reagent in liquid form to a loci on said surface, wherein said substrate is chemically prepared to react with said first reagent to covalently attach said reagent to said substrate; (b) displacing said multiple jet reagent dispenser relative to said surface, or the surface with respect to said multiple jet reagent dispenser, and applying at least one microdrop containing either the first reagent or a second reagent from a different dispenser jet to a second loci on said surface wherein said substrate is chemically prepared to react with said reagent to covalently attach said reagent to said substrate; (c) optionally repeating step (b) at least one time using either said first reagent, said second reagent, or different reagents in liquid form from different dispenser jets wherein each of said reagents covalently attaches to said substrate to form covalently attached compounds, and wherein said reagents in said microdrops comprise protected or unprotected nucleotides, thereby forming oligonucleotides attached at said loci; (d) washing said substrate to remove unattached reagents; (e) modifying said attached reagents; (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of oligonucleotides at each of at least 20 said loci is completed; (g) forming the oligonucleotide complements of said attached oligonucleotides by use of polymerase and nucleic acids, then washing said complements from said substrate with a denaturing agent.

Claim 19

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of a substrate, wherein said substrate comprises a porous material comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser at least one microdrop of a first reagent in liquid form to a loci on said surface, wherein said substrate is chemically prepared to react with said first reagent to covalently attach said reagent to said substrate; (b) displacing said multiple jet reagent dispenser relative to said surface, or the surface with respect to said multiple jet reagent dispenser, and applying at least one microdrop containing either the first reagent or a second reagent from a different dispenser jet to a second loci on said surface wherein said substrate is chemically prepared to react with said reagent to covalently attach said reagent to said substrate; (c) optionally repeating step (b) at least one time using either said first reagent, said second reagent, or different reagents in liquid form from different dispenser jets wherein each of said reagents covalently attaches to said substrate to form covalently attached compounds, and wherein said reagents in said microdrops comprise protected or unprotected nucleotides, thereby forming oligonucleotides attached at said loci; (d) washing said substrate to remove unattached reagents; (e) modifying said attached reagents; (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of oligonucleotides at each of at least 20 said loci is completed; (g) forming the oligonucleotide complements of said attached oligonucleotides by use of polymerase and nucleic acids, then washing said complements from said substrate with a denaturing agent.

Claim 20

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of a substrate, wherein said substrate comprise a porous material comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser at least one microdrop of a first reagent in liquid form to said surface at the first locus; (b) displacing the multiple jet reagent dispenser relative to said surface and applying through a second jet of said multiple jet reagent dispenser a second reagent to the first locus to form a mixture of reagents at the first locus wherein said substrate is chemically prepared to react with said mixture to covalently attach one or more of said reagents to said substrate at the first locus; (c) optionally repeating steps (a) and (b) at additional microdrop sized loci of said surface where the same mixture of reagents or a different mixture of reagents are formed at each locus, wherein reach reagent is dispensed from a different jet of said multiple jet reagent dispenser, and wherein said reagents in said microdrops comprise protected or unprotected nucleotides, thereby forming oligonucleotides attached at said loci; (d) washing said substrate to remove the excess reagents; (e) modifying said attached reagents; (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of oligonucleotides at each of at least 20 said loci is completed; (g) forming the oligonucleotide complements of said attached oligonucleotides by use of polymerase and nucleic acids, then washing said complements from said substrate with a denaturing agent.

Claim 21

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of a substrate, wherein said substrate comprise a porous material comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser at least one microdrop of a first reagent in liquid form to said surface at the first locus; (b) displacing the multiple jet reagent dispenser relative to said surface and applying through a second jet of said multiple jet reagent dispenser a second reagent to the first locus to form a mixture of reagents at the first locus wherein said substrate is chemically prepared to react with said mixture to covalently attach one or more of said reagents to said substrate at the first locus; (c) optionally repeating steps (a) and (b) at additional microdrop sized loci of said surface where the same mixture of reagents or a different mixture of reagents are formed at each locus, wherein reach reagent is dispensed from a different jet of said multiple jet reagent dispenser, and wherein said reagents in said microdrops comprise protected or unprotected nucleotides, thereby forming oligonucleotides attached at said loci; (d) washing said substrate to remove the excess reagents; (e) modifying said attached reagents; (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of oligonucleotides at each of at least 20 said loci is completed; (g) forming the oligonucleotide complements of said attached oligonucleotides by use of polymerase and nucleic acids, then washing said complements from said substrate with a denaturing agent.

Claim 24

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of a substrate comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser at least one microdrop of a first reagent in liquid form to loci on said surface, wherein said substrate comprises a porous membrane having straight, essentially parallel pores, is chemically prepared to react with said first reagent to covalently attach said reagent to said substrate; (b) displacing said multiple jet reagent dispenser relative to said surface, or the surface with respect to said multiple jet reagent dispenser, and applying at least one microdrop containing either the first reagent or a second reagent from a different dispenser jet to a second loci on said surface wherein said substrate is chemically prepared to react with said reagent to covalently attach said reagent to said substrate; (c) optionally repeating step (b) at least one time using either said first reagent, said second reagent, or different reagents in liquid form from different dispenser jets wherein each of said reagents covalently attaches to said substrate to form covalently attached compounds, and wherein said reagents in said microdrops comprise protected or unprotected nucleotides, thereby forming oligonucleotides attached at said loci; (d) washing said substrate to remove unattached reagents; (e) modifying said attached reagents; (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of oligonucleotides at each of at least 20 said loci is completed; (g) hybridizing oligonucleotide complements to said attached oligonucleotides, then washing said complements through said pores onto a second substrate, wherein the relative locations of said complements on said second substrate correspond to the relative locations of their respective oligonucleotides on said substrate from which they were removed.

Claim 25

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of a substrate comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser at least one microdrop of a first reagent in liquid form to loci on said surface, wherein said substrate comprises a porous membrane having straight, essentially parallel pores, is chemically prepared to react with said first reagent to covalently attach said reagent to said substrate; (b) displacing said multiple jet reagent dispenser relative to said surface, or the surface with respect to said multiple jet reagent dispenser, and applying at least one microdrop containing either the first reagent or a second reagent from a different dispenser jet to a second loci on said surface wherein said substrate is chemically prepared to react with said reagent to covalently attach said reagent to said substrate; (c) optionally repeating step (b) at least one time using either said first reagent, said second reagent, or different reagents in liquid form from different dispenser jets wherein each of said reagents covalently attaches to said substrate to form covalently attached compounds, and wherein said reagents in said microdrops comprise protected or unprotected nucleotides, thereby forming oligonucleotides attached at said loci; (d) washing said substrate to remove unattached reagents; (e) modifying said attached reagents; (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of oligonucleotides at each of at least 20 said loci is completed; (g) hybridizing oligonucleotide complements to said attached oligonucleotides, then washing said complements through said pores onto a second substrate, wherein the relative locations of said complements on said second substrate correspond to the relative locations of their respective oligonucleotides on said substrate from which they were removed.

Claim 26

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of a substrate comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser at least one microdrop of a first reagent in liquid form to said surface of said substrate at the first locus, and wherein said substrate comprises a porous membrane having straight, essentially parallel pores; (b) displacing the multiple jet reagent dispenser relative to said surface and applying through a second jet of said multiple jet reagent dispenser a second reagent to the first locus to form a mixture of reagents at the first locus wherein said substrate is chemically prepared to react with said mixture to covalently attach one or more of said reagents to said substrate at the first locus; (c) optionally repeating steps (a) and (b) at additional microdrop sized loci of said surface where the same mixture of reagents or a different mixture of reagents are formed at each locus, wherein each reagent is dispensed from a different jet of said multiple jet reagent dispenser, and wherein said reagents in said microdrops comprise protected or unprotected nucleotides, thereby forming oligonucleotides attached at said loci; (d) washing said substrate to remove the excess reagents; (e) modifying said attached reagents; (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of oligonucleotides at each of at least 20 said loci is completed; (g) hybridizing oligonucleotide complements to said attached oligonucleotides, then washing said complements through said pores onto a second substrate, wherein the relative locations of said complements on said second substrate correspond to the relative locations of their respective oligonucleotides on said substrate from which they were removed.

Claim 27

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of a substrate comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser at least one microdrop of a first reagent in liquid form to said surface of said substrate at the first locus, and wherein said substrate comprises a porous membrane having straight, essentially parallel pores; (b) displacing the multiple jet reagent dispenser relative to said surface and applying through a second jet of said multiple jet reagent dispenser a second reagent to the first locus to form a mixture of reagents at the first locus wherein said substrate is chemically prepared to react with said mixture to covalently attach one or more of said reagents to said substrate at the first locus; (c) optionally repeating steps (a) and (b) at additional microdrop sized loci of said surface where the same mixture of reagents or a different mixture of reagents are formed at each locus, wherein each reagent is dispensed from a different jet of said multiple jet reagent dispenser, and wherein said reagents in said microdrops comprise protected or unprotected nucleotides, thereby forming oligonucleotides attached at said loci; (d) washing said substrate to remove the excess reagents; (e) modifying said attached reagents; (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of oligonucleotides at each of at least 20 said loci is completed; (g) hybridizing oligonucleotide complements to said attached oligonucleotides, then washing said complements through said pores onto a second substrate, wherein the relative locations of said complements on said second substrate correspond to the relative locations of their respective oligonucleotides on said substrate from which they were removed.

Claim 31

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of an undifferentiated substrate comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser at least one microdrop of a first reagent in liquid form to a loci on said surface, wherein said undifferentiated substrate is porous material comprising a sheet having internal straight, essentially parallel pores, and is chemically prepared to react with said first reagent to covalently attach said reagent to said undifferentiated substrate; (b) displacing said multiple jet reagent dispenser relative to said surface, or the surface with respect to said multiple jet reagent dispenser, and applying at least one microdrop containing either the first reagent or a second reagent from a different dispenser jet to a second loci on said surface wherein said substrate is chemically prepared to react with said reagent to covalently attach said reagent to said substrate; (c) optionally repeating step (b) at least one time using either said first reagent, said second reagent, or different reagents in liquid form from different dispenser jets wherein each of said reagents covalently attaches to said substrate to form covalently attached compounds; (d) washing said substrate to remove unattached reagents; (e) modifying said attached reagents; and (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of different chemical compounds at each of at least 20 said loci is completed, wherein said compounds attached at said loci are cleavable from said substrate by exposure to laser or electron beams.

Claim 32

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of an undifferentiated substrate comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser at least one microdrop of a first reagent in liquid form to a loci on said surface, wherein said undifferentiated substrate is porous material comprising a sheet having internal straight, essentially parallel pores, and is chemically prepared to react with said first reagent to covalently attach said reagent to said undifferentiated substrate; (b) displacing said multiple jet reagent dispenser relative to said surface, or the surface with respect to said multiple jet reagent dispenser, and applying at least one microdrop containing either the first reagent or a second reagent from a different dispenser jet to a second loci on said surface wherein said substrate is chemically prepared to react with said reagent to covalently attach said reagent to said substrate; (c) optionally repeating step (b) at least one time using either said first reagent, said second reagent, or different reagents in liquid form from different dispenser jets wherein each of said reagents covalently attaches to said substrate to form covalently attached compounds; (d) washing said substrate to remove unattached reagents; (e) modifying said attached reagents; and (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of different chemical compounds at each of at least 20 said loci is completed, wherein said compounds attached at said loci are cleavable from said substrate by exposure to laser or electron beams.

Claim 33

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of an undifferentiated substrate comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser at least one microdrop of a first reagent in liquid form to said surface at the first locus of said undifferentiated substrate, wherein said undifferentiated substrate is a porous material comprising a sheet having internal straight, essentially parallel pores; (b) displacing the multiple jet reagent dispenser relative to said surface and applying through a second jet of said multiple jet reagent dispenser a second reagent to the first locus to form a mixture of reagents at the first locus wherein said substrate is chemically prepared to react with said mixture to covalently attach one or more of said reagents to said substrate at the first locus; (c) optionally repeating steps (a) and (b) at additional microdrop sized loci of said surface where the same mixture of reagents or a different mixture of reagents are formed at each locus, wherein each reagent is dispensed from a different jet of said multiple jet reagent dispenser; (d) washing said substrate to remove the excess reagents; (e) modifying said attached reagents; and (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of different chemical compounds at each of at least 20 said loci to completed, wherein said compounds attached at said loci are cleavable from said substrate by exposure to laser or electron beams.

Claim 34

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of an undifferentiated substrate comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser at least one microdrop of a first reagent in liquid form to said surface at the first locus of said undifferentiated substrate, wherein said undifferentiated substrate is a porous material comprising a sheet having internal straight, essentially parallel pores; (b) displacing the multiple jet reagent dispenser relative to said surface and applying through a second jet of said multiple jet reagent dispenser a second reagent to the first locus to form a mixture of reagents at the first locus wherein said substrate is chemically prepared to react with said mixture to covalently attach one or more of said reagents to said substrate at the first locus; (c) optionally repeating steps (a) and (b) at additional microdrop sized loci of said surface where the same mixture of reagents or a different mixture of reagents are formed at each locus, wherein each reagent is dispensed from a different jet of said multiple jet reagent dispenser; (d) washing said substrate to remove the excess reagents; (e) modifying said attached reagents; and (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of different chemical compounds at each of at least 20 said loci to completed, wherein said compounds attached at said loci are cleavable from said substrate by exposure to laser or electron beams.

Claim 39

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of an undifferentiated substrate comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser, consisting of multiple piezoelectric jet heads, at least one microdrop of a first reagent in liquid form to a loci on said surface, wherein said undifferentiated substrate is a porous material comprising a sheet having internal straight, essentially parallel pores, and is chemically prepared to react with said first reagent to covalently attach said reagent to said undifferentiated substrate; (b) displacing said multiple jet reagent dispenser relative to said surface, or the surface with respect to said multiple jet reagent dispenser, and applying at least one microdrop containing either the first reagent or a second reagent from a different dispenser jet to a second loci on said surface wherein said substrate is chemically prepared to react with said reagent to covalently attach said reagent to said substrate; (c) optionally repeating steps (b) at least one time using either said first reagent, said second reagent, or different reagents in liquid form from different dispenser jets wherein each of said reagents covalently attaches to said substrate to form covalently attached compounds; (d) washing said substrate to remove unattached reagents; (e) modifying said attached reagents; (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of different chemical compounds at each of at least 20 said loci is completed, and (g) optionally removing the attached compounds at said loci from said substrate, wherein said optional removing is performed in a selective or a non-selective manner.

Claim 40

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of an undifferentiated substrate comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser, consisting of multiple piezoelectric jet heads, at least one microdrop of a first reagent in liquid form to a loci on said surface, wherein said undifferentiated substrate is a porous material comprising a sheet having internal straight, essentially parallel pores, and is chemically prepared to react with said first reagent to covalently attach said reagent to said undifferentiated substrate; (b) displacing said multiple jet reagent dispenser relative to said surface, or the surface with respect to said multiple jet reagent dispenser, and applying at least one microdrop containing either the first reagent or a second reagent from a different dispenser jet to a second loci on said surface wherein said substrate is chemically prepared to react with said reagent to covalently attach said reagent to said substrate; (c) optionally repeating steps (b) at least one time using either said first reagent, said second reagent, or different reagents in liquid form from different dispenser jets wherein each of said reagents covalently attaches to said substrate to form covalently attached compounds; (d) washing said substrate to remove unattached reagents; (e) modifying said attached reagents; (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of different chemical compounds at each of at least 20 said loci is completed, and (g) optionally removing the attached compounds at said loci from said substrate, wherein said optional removing is performed in a selective or a non-selective manner.

Claim 41

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of an undifferentiated substrate comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser, consisting of multiple piezoelectric jet heads, at least one microdrop of a first reagent in liquid form to said surface at the first locus of said undifferentiated substrate, wherein said undifferentiated substrate is a porous material comprising a sheet having internal straight, essentially parallel pores; (b) displacing the multiple jet reagent dispenser relative to said surface and applying through a second jet of said multiple jet reagent dispenser a second reagent to the first locus to form a mixture of reagents at the first locus wherein said substrate is chemically prepared to react with said mixture to covalently attach one or more of said reagents to said substrate at the first locus; (c) optionally repeating steps (a) and (b) at additional microdrop sized loci of said surface where the same mixture of reagents or a different mixture of reagents are formed at each locus, wherein each reagent is dispensed from a different jet of said multiple jet reagent dispenser; (d) washing said substrate to remove the excess reagents; (e) modifying said attached reagents; (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of different chemical compounds at each of at least 20 loci is completed; and (g) optionally removing the attached compounds at said loci from said substrate, wherein said optional removing is performed in a selective or a non-selective manner.

Claim 42

A method of step-by-step synthesis of an array of different chemical compounds at microdrop-sized loci, where each compound is covalently attached to or beneath the surface of an undifferentiated substrate comprising the steps of: (a) applying through a single jet of a multiple jet reagent dispenser, consisting of multiple piezoelectric jet heads, at least one microdrop of a first reagent in liquid form to said surface at the first locus of said undifferentiated substrate, wherein said undifferentiated substrate is a porous material comprising a sheet having internal straight, essentially parallel pores; (b) displacing the multiple jet reagent dispenser relative to said surface and applying through a second jet of said multiple jet reagent dispenser a second reagent to the first locus to form a mixture of reagents at the first locus wherein said substrate is chemically prepared to react with said mixture to covalently attach one or more of said reagents to said substrate at the first locus; (c) optionally repeating steps (a) and (b) at additional microdrop sized loci of said surface where the same mixture of reagents or a different mixture of reagents are formed at each locus, wherein each reagent is dispensed from a different jet of said multiple jet reagent dispenser; (d) washing said substrate to remove the excess reagents; (e) modifying said attached reagents; (f) repeating steps (a) through (e) with the same or different reagents at various loci on the substrate until the synthesis of different chemical compounds at each of at least 20 loci is completed; and (g) optionally removing the attached compounds at said loci from said substrate, wherein said optional removing is performed in a selective or a non-selective manner.