US3516928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparation of lubricating oils
Assignee: BP PLC
•
Filing: 1967-02-21
•
Granted: 1970-06-23
•
Expires: 1987-02-21
Abstract
No abstract record available.
Inventors
- 👤 William Ronald King
- 👤 William Llewelyn Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:15
CPC Classifications
C; C10; C10G; C10G31/00; B; B01; B01D; B01D11/00; B01D11/04; B01D11/0403; B01D11/0407
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2391576A
Cited
US2391607A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-22 | 1973-12-22 | 1974-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-22 | 1977-12-22 | 1978-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-22 | 1981-12-22 | 1982-06-23 | $7700.00 | Window Closed / Lapsed |