Patent ID: 7967882

Claim:
A method of making a low-profile filter comprising: forming a filter housing having a top and bottom surface; machining a filter cavity into the filter housing, wherein the filter cavity is oriented to be generally horizontal in use; machining a first flow passage into the filter housing, wherein the first flow passage runs from an inlet in a first surface of the filter housing to a first section of the filter cavity and machining a second flow passage into the filter housing wherein the second flow passage leads from a second section of the filter cavity to an outlet at a second surface of the filter housing on the obverse side of the filter housing from the first surface; machining a pass-through flow passage into the filter housing, wherein the pass-through flow passage has a first pass-through passage opening and a second pass-through passage opening, the pass-through flow passage running from the first surface of the filter housing to the second surface of the filter housing and bypassing the filter cavity, and the inlet, outlet, first pass-through passage opening and the second pass-through passage opening are configured and spaced to interface with corresponding ports on a substrate block and a single gas device; forming a filter assembly; and sealing the filter assembly to a surface of the filter cavity to separate the filter cavity into adjacent sections including the first section of the filter cavity and the second section of the filter cavity.