US2581064A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treating oil with sulfur trioxide
Assignee: Standard Oil Development Co
•
Filing: 1948-06-05
•
Granted: 1952-01-01
•
Expires: 1968-06-05
Abstract
No abstract record available.
Inventors
- 👤 Francis M Archibald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:49
CPC Classifications
C; C10; C10G; C10G17/00; C10G17/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
PROCESS FOR THE TREATMENT OF PETROLEUM
Claim 2
Dependent Claim
6 words
PROCESS FOR THE TREATMENT OF PETROLEUM
References Cited (Backward Citations)
US1387835A
Cited
US1785270A
Cited
US2121167A
Cited
US2264904A
Cited
US2261206A
Cited
US2294884A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |