초록 ▼

An oil filter utilizes a thermoplastic material having oil oxidation and acidification arresting additives mounted in a casing between a particle filtering material (such as cotton fibers) and a felt pad. The thermoplastic material is desirably high molecular polypropylene in the form of rice-shaped

An oil filter utilizes a thermoplastic material having oil oxidation and acidification arresting additives mounted in a casing between a particle filtering material (such as cotton fibers) and a felt pad. The thermoplastic material is desirably high molecular polypropylene in the form of rice-shaped pellets, or spaghetti-shaped strands. The additives comprise about 10-17 weight % of the thermoplastic material/additive combination, and as the thermoplastic material is dissolved by above ambient temperature oil, the additives are released. The thermoplastic material pellets or strands are formed by mixing anti-oxidation and anti-acidification additives with liquid thermoplastic material to form a mixture, extruding the mixture into spaghetti like strands having a thickness of about 0.0625-0.125 inches, cooling the strands, cutting the strands into discrete elements, and then placing the discrete elements into an oil filter held in place to contact oil and to gradually dissolve to release the additives.

대표청구항 ▼

An oil filter for engines, hydraulic equipment, or automatic transmissions, comprising: a casing having first and second ends, and defining an interior volume, and having an opening adjacent said second end thereof; a particle filtering material comprising loose fibers filling up over 90% of said in

An oil filter for engines, hydraulic equipment, or automatic transmissions, comprising: a casing having first and second ends, and defining an interior volume, and having an opening adjacent said second end thereof; a particle filtering material comprising loose fibers filling up over 90% of said interior volume; a pad of interlocked fibers covering said opening adjacent said second end of said casing; and a plurality of discrete shapes of thermoplastic material which gradually dissolves in above ambient temperature oil, said thermoplastic material having oil oxidation and acidification arresting additives which are released into the oil over time as said thermoplastic material dissolves, said thermoplastic material disposed between said particle filtering material and said pad.