Abstract: A fluid filter includes a first filter, a second filter coaxial with the first filter, an inlet adjacent the first and second filters, a first outlet adjacent the inlet, and a second outlet at a distal end from the inlet and the first outlet. Further, the first and second filters may be housed in a unitary canister or a canister that has a canister body coupled to a removable canister cap. First and second springs urge each of the filters into sealing contact with respective gaskets at opposite ends of the device.

Abstract: A fluid filter includes a first filter, a second filter coaxial with the first filter, an inlet adjacent the first and second filters, a first outlet adjacent the inlet, and a second outlet at a distal end from the inlet and the first outlet. Further, the first and second filters may be housed in a unitary canister or a canister that has a canister body coupled to a removable canister cap. The bypass flow filter includes a cap having a plurality of blades.

Abstract: A filter element designed for engine oil lubrication and hydraulic oils, comprising a core having a hollow interior and a perforated outer surface, in fluid communication with the hollow interior, an open first end in fluid communication with the hollow interior, and a closed second end. The filter element comprises alternately wrapping one or more layers of flat sheet barrier filter material and, on top of the barrier filter material, winding, in a uniform winding pattern, one or more layers of cotton/cellulose composition yarn over the outer surface of the core, each layer having a progressively finer filtration as the oil moves radially from the exterior of the element inward towards the core.

Abstract: A filter element comprising a core having a hollow interior, a perforated outer surface, in fluid communication with the hollow interior, an open first end in fluid communication with the hollow interior, and a closed second end. The filter element comprises alternating layers of flat sheet filter material and lengths of cotton/cellulose composition yarn in a plurality of layers over the outer surface of the core, each layer adapted to filter a different size of contaminants, as well as trapping any paper and cotton particles breaking free from the yarn.

Abstract: A method of filtering internal combustion and industrial engine oil includes providing a specially wound filter element in a canister and passing the liquid through it slowly (e.g., 1-2 quarts per minute). The filter element includes a length of cotton/cellulose paper composition yard wound on a core in an irregular winding pattern such that some layers filter smaller (e.g., 1 micron) particles and others further from the core filter larger (e.g., 5 micron) particles. A filter element constructed according to the invention includes a core having a hollow interior, a perforated outer surface in fluid communication with the hollow interior, an open first end in fluid communication with the hollow interior, and a closed second end. A length of yarn of cotton and cellulose paper composition is wound in a series of layers over the outer surface of the core in the irregular winding pattern such that some layers closer the core filter particles down to a smaller size than do other layers further from the core.