US2652368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricating oil composition
Assignee: Shell Development Co
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Filing: 1949-06-21
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Granted: 1953-09-15
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Expires: 1969-06-21
Abstract
No abstract record available.
Inventors
- 👤 Donald S Melstrom
- 👤 Forrest J Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:23
CPC Classifications
F; F16; F16H; F16H57/00; F16H57/04; F16H57/041; C; C10; C10M; C10M151/00; C10M3/00; C10M2201/00; C10M2201/06; C10M2201/062; C10M2201/10; C10M2201/105; C10M2207/00; C10M2207/28; C10M2207/282; C10M2207/34; C10M2207/40; C10M2207/402; C10M2207/404; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/105; C10M2211/00; C10M2211/02; C10M2211/022; C10M2211/06; C10M2221/00; C10M2221/02; C10M2221/04; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/041; C10M2223/042; C10N; C10N2040/00; C10N2040/02; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
A LUBRICANT COMPRISING A HYDROCARBON LUBRICATING OIL BASE AND IN ADMIXTURE THEREWITH A MINOR AMOUNT SUFFICIENT TO IMPROVE THE VISOSITY INDEX OF THE OIL OF A COPOLYMER OF CRACKED WAX OLEFINS AND SURFCE DIOXIDE HAVING A MOLECULAR WEIGHT BETWEEN ABOUT 5000 AND 100,000.
Claim 2
Dependent Claim
43 words
A LUBRICANT COMPRISING A HYDROCARBON LUBRICATING OIL BASE AND IN ADMIXTURE THEREWITH A MINOR AMOUNT SUFFICIENT TO IMPROVE THE VISOSITY INDEX OF THE OIL OF A COPOLYMER OF CRACKED WAX OLEFINS AND SURFCE DIOXIDE HAVING A MOLECULAR WEIGHT BETWEEN ABOUT 5000 AND 100,000.
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) | 1956-09-14 | 1957-03-16 | 1957-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-14 | 1961-03-16 | 1961-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-14 | 1965-03-16 | 1965-09-15 | $7700.00 | Window Closed / Lapsed |