Oil filter containing an oil soluble thermoplastic additive material therein
US5591330A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 25, 1994 |
| Grant date | Jan 7, 1997 |
| Priority date | — |
| Expiry date | May 25, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2040/28
- WIPO fieldChemical engineering
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.