Abstract: A plastic oil filter comprises a cup-shaped shell with an open end. The shell contains an annular filter media with an elongated opening therethrough. A backplate is positioned in the open end of the shell. An elongated core is positioned in the opening in the filter media. The core is hollow and has a plurality of openings in the walls thereof. A plurality of longitudinally spaced annular rings are formed on the outer surface of the core. Fluid to be filtered can pass through openings in the backplate into the space between the shell and the filter media, through the filter media to be filtered, through the openings in the walls of the core, into the flow passage in the core, and exit from the filter through the flow passage in the core. Sealing washers are provided at each end of the filter media for preventing undesired flow between the core and the ID of the respective sealing washers. Spring structure is formed on the core.

Abstract: The improved in-line air filter apparatus of the present invention includes an air filter housing disposed in-line on the engine air intake hose of an internal combustion engine, with a tubular air filter element longitudinally disposed therein and having a closed axial end of such tubular air filter element disposed upstream of an open axial downstream end, with the open tubular end having a size and shape substantially congruent with the size and shape of the engine air intake hose of the internal combustion engine for minimizing the turbulence of the filtered air supplied thereto, and with the closed upstream tubular end having an annular shaped air inlet portion surrounding such closed upstream tubular end for directing air longitudinally and inwardly through the body of the tubular air filter element.

Abstract: A multistage filter unit comprises a housing having a closed end and an other end closed except for liquid inlet means and liquid outlet means. Within the housing are first and second filter elements. The improvement is characterized by the second filter element being comprised of a porous disc retained in or adjacent the opening of the first filter element by a foraminous element. The porous disc is deformable in response to increase in differential pressure due to clogging of the porous disc to reduce the liquid flow path through the porous disc and relieve some of the differential pressure, without opening an unfiltered path for liquid.

Abstract: A filter assembly comprises a housing, a liquid inlet in said housing, a liquid outlet in said housing, a filter pack in said housing, and valve means in said housing which is opened, for bypassing liquid about the filter pack when the liquid is cold and viscous and which is closed when the liquid is warmed and less viscous so that all liquid will pass through the filter pack. The liquid inlet and liquid outlet are each provided with one way check valves for controlling liquid flow into and out of the housing. A flow control orifice is provided in the liquid inlet to reduce housing pressure, without affecting flow of liquid through the filter pack and to reduce the possibility of leaks from housings with worn parts.

Abstract: A sealing gasket for an automotive air filter comprising an annular member which includes a base portion and a seal portion. The base portion is of harder durometer than the seal portion whereby the seal portion can more readily adapt to the contour of a contact surface which it may engage so as to provide a better seal between the sealing gasket and the contact surface. In a preferred form of the invention, the seal portion comprises an annular projecting part having a lower durometer than the base portion, said lower durometer being on the order of 25 Shore A.