US2426540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing hydrocarbon oil concentrates of barium sulfonates
Assignee: Sinclair Refining Co
•
Filing: 1945-06-06
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Granted: 1947-08-26
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Expires: 1965-06-06
Abstract
No abstract record available.
Inventors
- 👤 Franklin M Watkins
- 👤 Theodore A Hack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:13
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/01; C07C309/62; C10; C10M; C10M2219/00; C10M2219/04; C10M2219/044; C10N; C10N2070/00; C10N2070/02
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) | 1950-08-25 | 1951-02-24 | 1951-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-08-25 | 1955-02-24 | 1955-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-08-25 | 1959-02-24 | 1959-08-26 | $7700.00 | Window Closed / Lapsed |