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Patent US3523931A successfully refreshed from Google Patents.
US3523931A
Expired / Lapsed
US
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Metal free lubricant additives
Assignee: BP PLC
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Filing: 1966-09-07
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Granted: 1970-08-11
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Expires: 1986-09-07
Abstract
No abstract record available.
Inventors
- 👤 Eric Simon Forbes
- 👤 John Mansel Squire
- 👤 John Michael Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:09
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C08; C08F; C08F10/00; C08F26/00; C08F26/06; C10M2203/00; C10M2203/10; C10M2217/00; C10M2217/02; C10M2217/028; C10M2217/06
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) | 1973-08-10 | 1974-02-09 | 1974-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-10 | 1978-02-09 | 1978-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-10 | 1982-02-09 | 1982-08-11 | $7700.00 | Window Closed / Lapsed |