Apparatus for depositing a uniform thickness layer of particulate material

Claim 2

Apparatus for depositing in an even and uniform layer a particulate material on a substrate, said apparatus including (a) a housing including a longitudinal exit slit, and (b) means for moving said particulate as a gaseous suspension to said exit slit, said means including (1) a chamber in said housing, (2) a main conduit into which said suspension is received, and (3) a plurality of secondary conduits, dividing from one end of said main conduit, and each said secondary conduit being of equal length and internal diameter with the other end connected to said chamber within a length coextensive with said exit slit and at equally spaced intervals therealong.

Claim 3

The apparatus of claim 1 wherein said chamber is formed with a sub-chamber in the upstream direction with which said other ends connect, and a second slit connecting said sub-chamber with the remainder of said first recited chamber, said second, said slit being coextensive with said exit slit and having the profile of a Venturi passage.

Claim 4

The apparatus of claim 1 or 2 including means supplying an additional supply of gas, said supply means including a pair of side slits, said side slits communicating with said chamber, each of said side slits being parallel to each prior slit, and both equally spaced and coextensive with each prior slit, said side slits adapted to communicate a gas under pressure uniformly along their lengths to said chamber.

Claim 5

The apparatus of claim 3 wherein said housing includes both a divergent and a convergent portion upstream of said exit slit communicating said exit slit with said chamber.

Claim 6

The apparatus of claim 4 wherein said supply means includes an additional supply chamber communicating with each side slit, a plurality of orifices for passing said additional gas to said additional supply chambers, and a plurality of baffle conduits in each additional supply chamber.

Claim 7

The apparatus of claim 4 including auxiliary gas supply means for supply of at least one auxiliary gas to said chamber, said auxiliary gas supply means disposed within said divergent-convergent portion.

Claim 8

In combination, at least two apparatus adapted for depositing a particulate material in an even and uniform layer on a substrate, each said apparatus including (a) a housing including a longitudinal exit slit, and (b) means for moving said particulate as a gaseous suspension to said exit slit, said means including (1) a chamber in said housing, (2) a main conduit into which said suspension is recieved, and (3) a plurality of secondary conduits, dividing from one end of said main conduit, and each said secondary conduit being of equal length and internal diameter with the other end connected to said chamber within a length coextensive with said exit slit and at equally spaced intervals therealong, and wherein at least two of said apparatus are juxtaposed side-by-side whereby the overall length of said exit slit is equal to the summation of slit lengths.

Claim 9

In combination, at least two apparatus adapted for depositing a particulate material in an even and uniform layer on a substrate, each said apparatus including (a) a housing including a longitudinal exit slit, and (b) means for moving said particulate as a gaseous suspension to said exit slit, said means including (1) a chamber in said housing, (2) a main conduit into which said suspension is recieved, and (3) a plurality of secondary conduits, dividing from one end of said main conduit, and each said secondary conduit being of equal length and internal diameter with the other end connected to said chamber within a length coextensive with said exit slit and at equally spaced intervals therealong, and wherein at least two of said apparatus are juxtaposed side-by-side whereby the overall length of said exit slit is equal to the summation of slit lengths.

Claim 10

In combination, at least two apparatus adapted for depositing a particulate material in an even and uniform layer on a substrate, each said apparatus including (a) a housing including a longitudinal exit slit, and (b) means for moving said particulate as a gaseous suspension to said exit slit, and means including (1) a chamber in said housing, (2) a main conduit in which said suspension is received, and (3) a plurality of secondary conduits, dividing from one end of said main conduit, and each said secondary conduit being of equal length and internal diameter with the other end connected to said chamber within a length coextensive with said exit slit and at equally spaced intervals therealong, and wherein at least one apparatus is disposed on one side of said substrate and at least one apparatus is disposed on the other side of said substrate for deposit of product on the opposite surfaces.

Claim 11

In combination, at least two apparatus adapted for depositing a particulate material in an even and uniform layer on a substrate, each said apparatus including (a) a housing including a longitudinal exit slit, and (b) means for moving said particulate as a gaseous suspension to said exit slit, and means including (1) a chamber in said housing, (2) a main conduit in which said suspension is received, and (3) a plurality of secondary conduits, dividing from one end of said main conduit, and each said secondary conduit being of equal length and internal diameter with the other end connected to said chamber within a length coextensive with said exit slit and at equally spaced intervals therealong, and wherein at least one apparatus is disposed on one side of said substrate and at least one apparatus is disposed on the other side of said substrate for deposit of product on the opposite surfaces.

Claim 12

The combination of claim 8 wherein the apparatus on said one side and the other side include at least two apparatus juxtaposed in side-by-side relation whereby the overall length of said exit slit is equal to the summation of slit lengths.

Claim 13

The combination of claim 7 or 9 wherein further apparatus equal in number to said first-mentioned apparatus likewise are in juxtaposed side-by-side relation and disposed parallel thereto whereby different particulate materials may be deposited on the same surface of said substrate.