US3639237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extreme pressure greases
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1969-05-14
•
Granted: 1972-02-01
•
Expires: 1989-05-14
Abstract
Abstract A lubricating grease having extreme pressure (e.p.) properties comprising a major amount of lubricating oil and minor amounts of colloidal asbestos, finely divided polymeric fluorocarbon powder having a melting point (m.p.) above 450* F. and a powdered inorganic grease thickener. The colloidal asbestos is characterized by its chrysolite configuration and by its separate distinct fibers. The polymeric fluorocarbon is selected from the group consisting of polytetrafluoroethylene and fluorinated ethylene propylene copolymer. The inorganic thickeners are selected from the group consisting of talc, graphite and Group I, II and IV metal oxides and carbonates.
Inventors
- 👤 George G Curtis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:14
CPC Classifications
C; C10; C10M; C10M5/00; C10M2201/00; C10M2201/06; C10M2201/062; C10M2201/063; C10M2201/08; C10M2201/082; C10M2201/083; C10M2201/10; C10M2201/102; C10M2207/00; C10M2207/04; C10M2207/28; C10M2207/282; C10M2207/287; C10M2207/289; C10M2207/34; C10M2209/00; C10M2209/02; C10M2209/10; C10M2209/103; C10M2209/104; C10M2209/105; C10M2209/11; C10M2209/111; C10M2211/00; C10M2211/06; C10M2213/00; C10M2213/02; C10M2213/06; C10M2213/062; C10M2219/00; C10M2219/04; C10M2219/08; C10M2219/082; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/042; C10M2227/00; C10M2227/02; C10M2229/00; C10M2229/04; C10M2229/041; C10M2229/043; C10M2229/044; C10N; C10N2010/00; C10N2010/02; C10N2010/04; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
25 words
The lubricating composition of claim 1 wherein said polymeric fluorocarbon powder is selected from the group consisting of polytetrafluoroethylene and copolymer of tetrafluoroethylene and hexafluoropropylene.
Claim 2
Dependent Claim
14 words
A lubricating composition as in claim 1 wherein the inorganic thickener is zinc oxide.
Claim 3
Dependent Claim
13 words
A lubricating composition as in claim 1 wherein the inorganic thickener is talc.
Claim 4
Dependent Claim
29 words
A lubricating composition as in claim 1 wherein the combined amount of colloidal asbestos and inorganic thickener represents about 6 to about 30 weight percent of the total composition.
Claim 5
Dependent Claim
16 words
A lubricating composition as in claim 1 wherein the finely divided polymeric fluorocarbon powder is polytetrafluoroethylene.
Claim 6
Dependent Claim
30 words
A lubricating composition as in claim 1 wherein the finely divided polymeric fluorocarbon powder is characterized as having an average particle size ranging from about 5 to about 25 microns.
Claim 7
Dependent Claim
30 words
A lubricating composition as in claim 1 wherein the ratio of component (d) to the combined weight percent of components (b) and (c) ranges from about 0.5:1 to about 3:1.
Claim 8
Dependent Claim
58 words
A lubricating composition as in claim 1 wherein the colloidal asbestos forms about 3 to about 10 weight percent of the total lubricating grease composition, the finely divided polymeric fluorocarbon powder forms about 2 to about 10 weight percent of the total composition and the inorganic thickener forms about 3 to 20 weight percent of the total composition.
Claim 9
Dependent Claim
23 words
A method of improving the lubrication of relatively moving parts which comprises applying to said parts the grease composition defined by claim 1.
References Cited (Backward Citations)
US2877182A
Cited
US2836560A
Cited
US2890170A
Cited
US3011975A
Cited
US3159577A
Cited
US3248326A
Cited
US3288710A
Cited
US3314889A
Cited
US3350307A
Cited
US3437593A
Cited
US3424678A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |