Patent US3438897A successfully refreshed from Google Patents.
US3438897A
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Engine lubricating compositions
Assignee: Shell USA Inc
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Filing: 1966-10-10
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Granted: 1969-04-15
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Expires: 1986-10-10
Abstract
No abstract record available.
Inventors
- 👤 Bennett M Henderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:56
CPC Classifications
C; C10; C10M; C10M161/00; C10M2205/00; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/024; C10M2207/026; C10M2207/40; C10M2207/402; C10M2207/404; C10M2209/00; C10M2209/10; C10M2209/103; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/06; C10M2215/064; C10M2215/065; C10M2215/24; C10M2215/26; C10M2217/00; C10M2217/02; C10M2217/028; C10M2217/04; C10M2217/046; C10M2217/06; C10M2219/00; C10M2219/04; C10M2219/046; C10M2219/08; C10M2219/082; C10M2219/083; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/041; C10M2223/042; C10M2223/045; C10M2223/06; C10M2223/061; C10M2223/065; C10M2223/12; C10M2225/00; C10M2225/04; C10M2229/00; C10M2229/04; C10M2229/041; C10N; C10N2010/00; C10N2010/04; C10N2010/08; C10N2020/00; C10N2020/01; C10N2040/00; C10N2040/02; C10N2040/135; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 0
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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) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |