Patent US2952631A successfully refreshed from Google Patents.
US2952631A
Expired / Lapsed
US
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Distillation of lubricating oil
Assignee: Shell USA Inc
•
Filing: 1957-11-26
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Granted: 1960-09-13
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Expires: 1977-11-26
Abstract
No abstract record available.
Inventors
- 👤 Douglas C Hausch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:53
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/143; C; C10; C10G; C10G7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1744261A
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US2032666A
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US2125325A
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US1947817A
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US2095418A
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US2085422A
Cited
US2805981A
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US2809923A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-13 | 1964-03-14 | 1964-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-13 | 1968-03-14 | 1968-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-13 | 1972-03-14 | 1972-09-13 | $7700.00 | Window Closed / Lapsed |