Patent US2939840A successfully refreshed from Google Patents.
US2939840A
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Silica-thickened grease containing alkylene carbonate dispersant
Assignee: Pure Oil Co
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Filing: 1957-05-14
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Granted: 1960-06-07
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Expires: 1977-05-14
Abstract
No abstract record available.
Inventors
- 👤 Ernest T Fronczak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:45
CPC Classifications
C; C10; C10M; C10M5/00; C10M2201/00; C10M2201/10; C10M2201/105; C10M2203/00; C10M2203/10; C10M2203/108; C10M2207/00; C10M2207/28; C10M2207/282; C10M2207/32; C10M2207/34; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/105; C10M2209/107; C10M2227/00; C10M2227/02; C10M2227/04; C10M2229/00; C10M2229/02; C10M2229/04; C10M2229/05; C10N; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
A LUBRICATING GREASE COMPOSITION COMPRISING A MAJOR PORTION OF AN OLEAGINOUS LUBRICATING LIQUID HAVING INCORPORATED THEREIN SUFFICIENT FINELY-DIVIDED SILICA TO PRODUCE A GEL-LIKE GREASE STRUCTURE AND A SUFFICIENT AMOUNT OF A C2-C18 ALKYLENE CARBONATE TO EFFECT A COMPLETE DISPERSION OF THE SILICA.
Claim 2
Dependent Claim
42 words
A LUBRICATING GREASE COMPOSITION COMPRISING A MAJOR PORTION OF AN OLEAGINOUS LUBRICATING LIQUID HAVING INCORPORATED THEREIN SUFFICIENT FINELY-DIVIDED SILICA TO PRODUCE A GEL-LIKE GREASE STRUCTURE AND A SUFFICIENT AMOUNT OF A C2-C18 ALKYLENE CARBONATE TO EFFECT A COMPLETE DISPERSION OF THE SILICA.
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) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |