Paper roll filter structure

Claim 1

A filter for regenerating oil in combustion engines with a replaceable tissue filter roll comprising; a cylindrical filter housing having a top and bottom sealed by first and second circular plates, respectively, said first plate containing an inlet and said second plate containing an outlet; a replaceable tissue filter roll wrapped on a thin wall carton tube; a rubber tube located within and supporting said thin wall carton tube against collapse having lengthwise running flutes around its outer-circumference, said rubber tube having a sealing circular plate at its top end and a tapered smooth collar below the circular plate; an oil pressure responsive bypass in flow communication with the inlet and an inner cylindrical space within the rubber tube; and an annular element closing the bottom of the rubber tube and provided with holes that form a flow path between the flutes of the rubber tubes and said outlet in said second plate, whereby the thin wall carton tube is punctured by oil pressure exerted from outside the thin wall carton tube upon the flutes and oil within the rubber tube exserting back pressure against the tube.