Oil filter containing an oil soluble thermoplastic additive material therein
First Claim
1. 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.
1 Assignment
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Accused Products
Abstract
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.
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Citations
21 Claims
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1. An oil filter for engines, hydraulic equipment, or automatic transmissions, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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- 15. An oil filter as recited in claim I wherein said thermoplastic material is in the form of pellets.
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17. An oil filter for engines, hydraulic equipment, or automatic transmissions comprising:
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a casing having first and second ends, and defining an interior volume, and having inlet and outlet openings; a particle filtering material comprising loose fibers disposed in said interior volume; and a plurality of pellets of thermoplastic material which gradually dissolve in above ambient temperature oil, said material having oil oxidation and acidification arresting additives which are released into the oil over time as said material dissolves, said pellets disposed in said interior volume adjacent said loose fibers. - View Dependent Claims (18, 19)
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20. An oil filter for engines, hydraulic equipment, or automatic transmissions comprising:
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a casing having first and second ends, and defining an interior volume, and having inlet and outlet openings; a particle filtering material comprising loose fibers disposed in said interior volume; and a thermoplastic material disposed in said interior volume adjacent said loose fibers, said thermoplastic material having oil oxidation and acidification arresting additives which are released into the oil over time as said material dissolves, said material comprising polypropylene in the form of a plurality of discrete shapes each having a thickness of about 0.0625-0.125 inches. - View Dependent Claims (21)
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Specification