Filter screen

Claim 2

A filter medium consisting of a. a woven metallic wire screening fabric having micro openings therein, the size of the openings being in the range of from 5 to 300 microns, in sintered cohered relation to b. a rigid supporting grid of flattened expanded metal having macro openings therein, said openings having closed peripheries and the center-to-center dimension of the openings being from 0.5 to 2 inches, and said grid having substantially planar faces, the metals of said screening fabric and said supporting grid being of an equivalent chemical composition and wherein the area of cohesion is coextensive with the confronting surface area of the grid.

Claim 3

A filter medium in accordance with claim 1 wherein the screening fabric is stainless steel.

Claim 4

A filter medium in accordance with claim 1 wherein the fabric is thermally cohered to said supporting grid.

Claim 5

A filter medium in accordance with claim 1 which is rectangularly configured.

Claim 6

A filter medium in accordance with claim 1 also including a marginal reinforcing bead along its edges.

Claim 7

A filter medium in accordance with claim 5 in which the marginal bead is a U-shaped channel.

Claim 8

A filter medium in accordance with claim 1 wherein the woven wire screening fabric is a Dutch twill weave of stainless steel having upwards of 3,600 to 250,000 openings per square inch.

Claim 9

In a water straining apparatus including a drum body, the improvement which comprises a filtering surface on said drum body formed from a plurality of adjacently disposed panels each cOnsisting of: a. a woven metallic wire screening fabric having micro openings therein, the size of the openings being in the range of from 5 to 300 microns, in sintered cohered relation to b. a rigid supporting grid of flattened expanded metal having macro openings therein, said openings having closed peripheries and the center-to-center dimension of the openings being from 0.5 to 2 inches, and said grid having substantially planar faces, and c. means coacting with the marginal edges of said panels for securing said panels to said drum body, the metals of said screening fabric and said supporting grid being of an equivalent chemical composition and wherein the area of cohesion is coextensive with the confronting surface area of the grid.

Claim 10

In a water straining apparatus including a drum body, the improvement which comprises a filtering surface on said drum body formed from a plurality of adjacently disposed panels each cOnsisting of: a. a woven metallic wire screening fabric having micro openings therein, the size of the openings being in the range of from 5 to 300 microns, in sintered cohered relation to b. a rigid supporting grid of flattened expanded metal having macro openings therein, said openings having closed peripheries and the center-to-center dimension of the openings being from 0.5 to 2 inches, and said grid having substantially planar faces, and c. means coacting with the marginal edges of said panels for securing said panels to said drum body, the metals of said screening fabric and said supporting grid being of an equivalent chemical composition and wherein the area of cohesion is coextensive with the confronting surface area of the grid.

Claim 11

A water straining apparatus comprising in combination a cylindrical drum body and a filtering surface on said drum body, said filtering surface being formed from a plurality of adjacently disposed filter media panels covering the cylindrical surface of said drum body and each consisting of: a. a woven metallic wire screening fabric having micro openings therein, the size of the openings being in the range of from 5 to 300 microns, in sintered cohered relation to b. a rigid supporting grid of flattened expanded metal having macro openings therein, said openings having closed peripheries and the center-to-center dimension of the openings being from 0.5 to 2 inches, and said grid having substantially planar faces, and c. means coacting with the marginal edges of said panels for securing said panels to said drum body, the metals of said screening fabric and said supporting grid being of an equivalent chemical composition and wherein the area of cohesion is coextensive with the confronting surface area of the grid.

Claim 12

A water straining apparatus comprising in combination a cylindrical drum body and a filtering surface on said drum body, said filtering surface being formed from a plurality of adjacently disposed filter media panels covering the cylindrical surface of said drum body and each consisting of: a. a woven metallic wire screening fabric having micro openings therein, the size of the openings being in the range of from 5 to 300 microns, in sintered cohered relation to b. a rigid supporting grid of flattened expanded metal having macro openings therein, said openings having closed peripheries and the center-to-center dimension of the openings being from 0.5 to 2 inches, and said grid having substantially planar faces, and c. means coacting with the marginal edges of said panels for securing said panels to said drum body, the metals of said screening fabric and said supporting grid being of an equivalent chemical composition and wherein the area of cohesion is coextensive with the confronting surface area of the grid.