Patent US3988248A successfully refreshed from Google Patents.
US3988248A
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US
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Lithium soap lubricating grease
Assignee: Wintershall Dea International AG
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Filing: 1975-03-17
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Granted: 1976-10-26
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Expires: 1995-03-17
Abstract
Abstract A grease which has improved stability at high temperature is provided by incorporating in an otherwise conventional grease a lithium soap of a hydroxy-stearic acid and an alkali borate. The grease is made by adding lithium tetraborate directly to a mixture comprising a lithium soap of a hydroxy-fatty acid and lubricating oil wherein the resulting mixture has from about 5 to 20 percent by weight of the lithium soap and from about 0.1 to 3 percent by weight of lithium tetraborate.
Inventors
- 👤 Hans Dieter Grasshoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:54
CPC Classifications
C; C10; C10M; C10M5/00; C10M2201/00; C10M2201/087; C10M2203/00; C10M2203/06; C10M2207/00; C10M2207/04; C10M2207/10; C10M2207/12; C10M2207/125; C10M2207/28; C10M2207/282; C10M2207/283; C10M2207/34; C10M2209/00; C10M2209/02; C10M2209/10; C10M2209/103; C10M2211/00; C10M2211/02; C10M2215/00; C10M2215/02; C10M2215/06; C10M2215/064; C10M2215/065; C10M2219/00; C10M2219/06; C10M2219/062; C10M2219/066; C10M2219/068; C10M2229/00; C10M2229/02; C10M2229/04; C10M2229/05; C10N; C10N2010/00; C10N2010/02; C10N2010/04; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
82 words
A lithium soap lubricating grease comprising 5 to 20 percent by weight of a lithium soap of a hydroxy fatty acid having 10 to 30 carbon atoms, 0.1 to 3 percent by weight of lithium tetraborate, and the remainder of lubricating oil, made by a process comprising: admixing lithium soap and a mojor amount of the base oil; dehydrating; adding lithium tetraborate; heating to a higher temperature of about 240° C.; adding the remaining portion of the base oil; cooling; and homogenizing.
Claim 2
Dependent Claim
82 words
A lithium soap lubricating grease comprising 5 to 20 percent by weight of a lithium soap of a hydroxy fatty acid having 10 to 30 carbon atoms, 0.1 to 3 percent by weight of lithium tetraborate, and the remainder of lubricating oil, made by a process comprising: admixing lithium soap and a mojor amount of the base oil; dehydrating; adding lithium tetraborate; heating to a higher temperature of about 240° C.; adding the remaining portion of the base oil; cooling; and homogenizing.
Claim 3
Dependent Claim
17 words
A process of claim 1 wherein the lithium soap is the lithium soap of a hydroxy-stearic acid.
Claim 4
Dependent Claim
15 words
A process of claim 1 containing the lithium soap of the previously esterified 12-hydroxystearic acid.
Claim 5
Dependent Claim
28 words
A process of claim 1 containing the lithium soap of 12-hydroxystearic acid which has previously been exterified with methyl alcohol, ethyl alcohol, propyl alcohol, butyl alcohol or glycerine.
Claim 6
Dependent Claim
28 words
A process of claim 1 wherein the grease comprises from 7.5 to 15 weight percent of lithium soap and from 0.15 to 0.75 weight percent of lithium tetraborate.
References Cited (Backward Citations)
US3758407A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-26 | 1980-04-26 | 1980-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-26 | 1984-04-26 | 1984-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-26 | 1988-04-26 | 1988-10-26 | $7700.00 | Window Closed / Lapsed |