US5772874A — High performance liquid chromatography method and…

Claim 1

Independent Claim 110 words

Chromatography apparatus comprising, in combination, a chromatographic body formed as a substantially uniformly distributed multiplicity of rigid, solid, porous particles with chromatographically active surfaces, said particles having average diameters of greater than about 30 μm, the interstitial volume between said particles being not less than about 45% of the total volume of said column; and means for loading said surfaces with at least one solute that is reactive with said surfaces, by flowing a liquid mixture containing said solute through said body at a velocity sufficient to induce flow of said mixture within at least a substantial portion of said interstitial volume at a reduced velocity greater than about 5,000.

Claim 2

Dependent Claim 110 words

Chromatography apparatus comprising, in combination, a chromatographic body formed as a substantially uniformly distributed multiplicity of rigid, solid, porous particles with chromatographically active surfaces, said particles having average diameters of greater than about 30 μm, the interstitial volume between said particles being not less than about 45% of the total volume of said column; and means for loading said surfaces with at least one solute that is reactive with said surfaces, by flowing a liquid mixture containing said solute through said body at a velocity sufficient to induce flow of said mixture within at least a substantial portion of said interstitial volume at a reduced velocity greater than about 5,000.

Claim 3

Dependent Claim 18 words

Chromatography apparatus as set forth in claim 1 wherein said mean diameters of said particles are substantially uniform.

Claim 4

Dependent Claim 39 words

Chromatography apparatus as set forth in claim 1 wherein said interstitial volume comprises a multiplicity of interstitial channels between said particles, at least the majority of said channels having mean cross-section dimensions substantially not less than about 5 μm.

Claim 5

Dependent Claim 25 words

Chromatography apparatus as set forth in claim 1 wherein said particles are coated with stationary phase layers so as to render said surfaces chromatographically active.

Claim 6

Dependent Claim 30 words

Chromatography apparatus as set forth in claim 1 wherein said particles are substantially incompressible so as to substantially resist plastic deformation at packing pressures up to about 1×10 4 psi.

Claim 7

Dependent Claim 25 words

Chromatography apparatus as set forth in claim 1 wherein said particles are formed from one or more of alumina, silica, titania, vanadia, zirconia and carbon.

Claim 8

Dependent Claim 30 words

Chromatography apparatus as set forth in claim 1 wherein the pores in said particles have mean diameters lying within the range of from about 60 Å to about 5,000 Å.

Claim 9

Dependent Claim 25 words

Chromatography apparatus as set forth in claim 1 wherein said particles are packed together under a pressure of substantially not less than 5×10 3 psi.

Claim 10

Dependent Claim 54 words

Chromatography apparatus as set forth in claim 1 including means for eluting loaded solute from said body by flowing an eluant fluid through said body at a velocity sufficient to induce flow of said eluant fluid within at least a substantial portion of said interstitial volume at a reduced velocity greater than about 5,000.

Claim 11

Dependent Claim 76 words

Chromatography apparatus as set forth in claim 1 including means for eluting loaded solute from said body by flowing an eluant fluid through said interstitial volume at a velocity selected such that band spreading of solute eluted by said eluant fluid from said body is an inverse function of the Reynolds number for the eluant fluid flow and is a direct function of the magnitude of the diffusion coefficient of said solute in said eluant fluid.

Claim 12

Dependent Claim 51 words

Chromatography apparatus as set forth in claim 1 including means for eluting loaded solute from said flowing an eluant fluid through said interstitial volume at a velocity selected such that band spreading of solute eluted by said eluant fluid from said body decreases with increasing Reynolds number of the eluant flow.

Claim 13

Dependent Claim 61 words

Chromatography apparatus as set forth in claim 1 including means for eluting loaded solute rom said body by flowing eluant fluid through said interstitial volume at a velocity selected such that band spreading of solute eluted by said eluant fluid from said body is a direct function of the magnitude of the diffusion coefficient of said solute in said eluant fluid.

Claim 14

Dependent Claim 98 words

Chromatography apparatus comprising, in combination, a chromatographic column formed as a substantially uniformly distributed, packed multiplicity of rigid, solid, porous particles with chromatographically active surfaces, said particle having substantially uniform average diameters of not less than about 500 μm, and means for loading said surfaces with at least one solute that is reactive with said surfaces, by flowing a liquid mixture containing said solute through said column at a velocity sufficient to induce flow of said mixture within at least a substantial portion of the interstitial volume between said particles at a reduced velocity greater than about 50,000.

Claim 15

Dependent Claim 98 words

Chromatography apparatus comprising, in combination, a chromatographic column formed as a substantially uniformly distributed, packed multiplicity of rigid, solid, porous particles with chromatographically active surfaces, said particle having substantially uniform average diameters of not less than about 500 μm, and means for loading said surfaces with at least one solute that is reactive with said surfaces, by flowing a liquid mixture containing said solute through said column at a velocity sufficient to induce flow of said mixture within at least a substantial portion of the interstitial volume between said particles at a reduced velocity greater than about 50,000.

Claim 16

Dependent Claim 35 words

Chromatography apparatus as set forth in claim 13 including means for eluting loaded solute from said column by flowing an eluant fluid through said column at a reduced velocity value of at least about 50,000.

Claim 17

Dependent Claim 113 words

In chromatography apparatus including a chromatographic column formed as a bed of a packed multiplicity of rigid solid particles having substantially uniform mean diameters of not less than about 30 μm, the surfaces of said particles being chromatographically active and wherein a solute introduced into said bed tends to become non-specifically bound to said particles, the improvement including means for injecting a liquid mixture comprising said solute into said column at a reduced velocity greater than about 5,000 so as to load said particles with said solute; and means for eluting the loaded solute from said particles by flowing eluant fluid through said column at an average reduced velocity greater than about 5000.

Claim 18

Dependent Claim 113 words

In chromatography apparatus including a chromatographic column formed as a bed of a packed multiplicity of rigid solid particles having substantially uniform mean diameters of not less than about 30 μm, the surfaces of said particles being chromatographically active and wherein a solute introduced into said bed tends to become non-specifically bound to said particles, the improvement including means for injecting a liquid mixture comprising said solute into said column at a reduced velocity greater than about 5,000 so as to load said particles with said solute; and means for eluting the loaded solute from said particles by flowing eluant fluid through said column at an average reduced velocity greater than about 5000.

Claim 19

Dependent Claim 90 words

A chromatographic column comprising, in combination, a container packed with a substantially uniformly distributed multiplicity of rigid, solid, porous particles with chromatographically active surfaces, said particle having substantially uniform average diameters in the range between about 30 to about 500 μm, the interstitial volume between said particles being greater than about 45% of the total volume of said body, said volume being formed of a multiplicity of interstitial channels between said particles, at least a majority of said channels having mean cross-section dimensions substantially not less than about 5 μm.

Claim 20

Dependent Claim 90 words

A chromatographic column comprising, in combination, a container packed with a substantially uniformly distributed multiplicity of rigid, solid, porous particles with chromatographically active surfaces, said particle having substantially uniform average diameters in the range between about 30 to about 500 μm, the interstitial volume between said particles being greater than about 45% of the total volume of said body, said volume being formed of a multiplicity of interstitial channels between said particles, at least a majority of said channels having mean cross-section dimensions substantially not less than about 5 μm.

Claim 21

Dependent Claim 26 words

A chromatographic column as set forth in claim 16 wherein said particles are coated with stationary phase layers so as to render said surfaces chromatographically active.

Claim 22

Dependent Claim 31 words

A chromatographic column as set forth in claim 16 wherein said particles are substantially incompressible so as to substantially resist plastic deformation at packing pressures up to about 1×10 4 psi.

Claim 23

Dependent Claim 26 words

A chromatographic column as set forth in claim 16 wherein said particles are formed from one or more of alumina, silica, titania, vanadia, zirconia and carbon.

Claim 24

Dependent Claim 31 words

A chromatographic column as set forth in claim 16 wherein the pores in said particles have mean diameters lying within the range of from about 60 Å to about 5,000 Å.

Claim 25

Dependent Claim 26 words

A chromatographic column as set forth in claim 16 wherein said particles are packed together under a pressure of substantially not less than 5×10 3 psi.

Claim 26

Dependent Claim 24 words

A chromatographic column apparatus as set forth in claim 16 wherein said particles are selected to have diameters of at least about 500 μm.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2001-06-29	2001-12-29	2002-06-30	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2005-06-29	2005-12-29	2006-06-30	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2009-06-29	2009-12-29	2010-06-30	$7700.00	Window Closed / Lapsed

High performance liquid chromatography method and apparatus

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