Patent US1981305A successfully refreshed from Google Patents.
US1981305A
Expired / Lapsed
US
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Process and apparatus for the catalytic treatment of petroleum
Assignee: Union Oil Company of California
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Filing: 1929-08-10
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Granted: 1934-11-20
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Expires: 1949-08-10
Abstract
No abstract record available.
Inventors
- 👤 Ulric B Bray
- 👤 Ralph C Pollock
- 👤 David R Merrill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:55
CPC Classifications
C; C10; C10G; C10G17/00; C10G17/095; C10G29/00; C10G45/00; C10G45/02; C10G45/04
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) | 1937-11-19 | 1938-05-21 | 1938-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-11-19 | 1942-05-21 | 1942-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-11-19 | 1946-05-21 | 1946-11-20 | $7700.00 | Window Closed / Lapsed |