Patent US2181964A successfully refreshed from Google Patents.
US2181964A
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US
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Sulphurized lubricating oil
Assignee: Pure Oil Co
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Filing: 1931-11-18
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Granted: 1939-12-05
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Expires: 1951-11-18
Abstract
No abstract record available.
Inventors
- 👤 Martin B Chittick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:18
CPC Classifications
C; C10; C10M; C10M135/00; C10M135/02; C10M135/04; C10M2207/00; C10M2207/40; C10M2207/404; C10M2221/00; C10M2221/04; C10M2221/041; C10N; C10N2040/00; C10N2040/20; C10N2040/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-12-04 | 1943-06-05 | 1943-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-12-04 | 1947-06-05 | 1947-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-12-04 | 1951-06-05 | 1951-12-05 | $7700.00 | Window Closed / Lapsed |