US2853427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing lubricating oils
Assignee: Sinclair Refining Co
•
Filing: 1955-05-23
•
Granted: 1958-09-23
•
Expires: 1975-05-23
Abstract
No abstract record available.
Inventors
- 👤 Herman R Bentley
- 👤 Maurice K Rausch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:45
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/06; C10G21/12; C10G21/003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2603587A
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US2687982A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |