US2456723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective copper solvent for diolifin extraction
Assignee: Standard Oil Development Co
•
Filing: 1946-05-13
•
Granted: 1948-12-21
•
Expires: 1966-05-13
Abstract
No abstract record available.
Inventors
- 👤 Leland K Beach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:26
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2245719A
Cited
US2381311A
Cited
US2376239A
Cited
US2384329A
Cited
US2401896A
Cited
US2369559A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-21 | 1952-06-21 | 1952-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-21 | 1956-06-21 | 1956-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-21 | 1960-06-21 | 1960-12-21 | $7700.00 | Window Closed / Lapsed |