Patent US2176884A successfully refreshed from Google Patents.
US2176884A
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Process for producing an improved lubricating oil
Assignee: Atlantic Richfield Co
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Filing: 1937-09-23
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Granted: 1939-10-24
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Expires: 1957-09-23
Abstract
No abstract record available.
Inventors
- 👤 John G Butz
- 👤 Leonard N Leum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:38
CPC Classifications
C; C10; C10G; C10G29/00; C10G29/06; C10G29/12
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) | 1942-10-23 | 1943-04-24 | 1943-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-10-23 | 1947-04-24 | 1947-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-10-23 | 1951-04-24 | 1951-10-24 | $7700.00 | Window Closed / Lapsed |