US2726261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing concentrates of sulfonic acids in petroleum oils
Assignee: Sinclair Refining Co
•
Filing: 1952-07-08
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Granted: 1955-12-06
•
Expires: 1972-07-08
Abstract
No abstract record available.
Inventors
- 👤 Edward J Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:30
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/01; C07C309/62; C10; C10G; C10G17/00; C10G17/02; C10G17/04; C10G17/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1705809A
Cited
US2155367A
Cited
US1977717A
Cited
US2189128A
Cited
US2412916A
Cited
US2459419A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-05 | 1959-06-06 | 1959-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-05 | 1963-06-06 | 1963-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-05 | 1967-06-06 | 1967-12-06 | $7700.00 | Window Closed / Lapsed |