Patent ID: 9522354
Filing Date: 2016-12-20
CPC Classification: B01D,Y10T

Claim Text:
1. A method of making a filter assembly comprising at least one filter cap and a filter material comprising the steps of: forming a first composite sheet comprising a metal sheet layer having a planar surface and a surface layer on the planar surface comprising a plastisol wherein the plastisol adheres to the planar surface of the metal sheet layer in solid form at room temperature; stamping the first composite sheet to form a first filter cap having a base section with a filter facing surface and an outer facing surface and at least one upwardly extending perimeter wall having a filter facing surface and an exterior facing surface wherein the at least one upwardly extending perimeter wall extends upwardly from the base section and wherein the perimeter wall defines the base section of the first filter cap and wherein the filter facing surface of the base section and the filter facing surface of the upwardly extending perimeter wall each comprises the plastisol; placing a filter material into contact with the plastisol on at least the filter facing surface of the base section; and applying heat to at least a portion of the plastisol of the first filter cap at a temperature sufficient to liquefy at least a portion of the plastisol of the first filter cap and cause the plastisol of the first filter cap to adhere to the filter material.