Patent US3537996A successfully refreshed from Google Patents.
US3537996A
Expired / Lapsed
US
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Manufacture of overbased calcium sulfonate lubricating oil compositions
Assignee: Texaco Inc
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Filing: 1967-12-12
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Granted: 1970-11-03
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Expires: 1987-12-12
Abstract
No abstract record available.
Inventors
- 👤 Edward H Holst
- 👤 Robert S Edwards
- 👤 John E May
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:30
CPC Classifications
C; C10; C10M; C10M159/00; C10M159/12; C10M159/20; C10M159/24; C10M2201/00; C10M2201/06; C10M2201/062; C10M2219/00; C10M2219/04; C10M2219/046; C10N; C10N2010/00; C10N2010/04
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) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |