Patent US3640859A successfully refreshed from Google Patents.
US3640859A
Expired / Lapsed
US
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Grease compositions
Assignee: United States Department of the Army
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Filing: 1969-09-24
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Granted: 1972-02-08
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Expires: 1989-09-24
Abstract
Abstract Stable grease compositions having excellent extreme pressure properties, among other, the grease consisting of about 68-73.5 weight percent bis(m-phenoxyphenyl) ether having a pour point of +4.5* C., balance being tetrafluoroethylene polymer having a molecular weight 10,000-50,000, softening point 321.1* C., particle size less than 30 microns in diameter, and supplied as a 7.5 percent suspension is trichlorotrifluoroethane.
Inventors
- 👤 Joseph F Messina
- 👤 Henry Gisser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:55
CPC Classifications
C; C10; C10M; C10M7/00; C10M2207/00; C10M2207/04; C10M2209/00; C10M2209/02; C10M2209/10; C10M2211/00; C10M2211/06; C10M2213/00; C10M2213/02; C10M2213/06; C10M2213/062; C10N; C10N2050/00; C10N2050/08; C10N2050/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
28 words
The composition of claim 1 wherein said polymer has a molecular weight between about 10,000 to 50,000 and a particle size less than about 30 microns in diameter.
Claim 2
Dependent Claim
46 words
The composition of claim 1 wherein said bis(m-phenoxyphenyl) ether comprises about 68 to 73.5 weight percent of said grease composition, the balance being substantially tetrafluoroethylene polymer having a molecular weight between about 10,000 to 50,000 and a particle size less than about 30 microns in diameter.
Claim 3
Dependent Claim
61 words
A homogeneous grease composition exhibiting good extreme pressure properties, good shear stability, low-fluid separation, high-dropping point and good oxidation stability consisting essentially of about 73.5 weight percent bis(m-phenoxyphenyl) ether having a pour point of about 4.5* C. and tetrafluoroethylene polymer having a molecular weight ranging between about 10,000 to 50,000 and a particle size of less than 30 microns in diameter.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |