US2491920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diesters of 1-ketophosphonic acids
Assignee: EIDP Inc
•
Filing: 1946-05-16
•
Granted: 1949-12-20
•
Expires: 1966-05-16
Abstract
No abstract record available.
Inventors
- 👤 Ernsberger Maurice Leon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:15
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4003; C07F9/4062; C07F9/4065; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/26; C10L1/2608; C10M; C10M2223/00; C10M2223/06; C10M2223/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2389576A
Cited
US2397422A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-19 | 1953-06-20 | 1953-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-19 | 1957-06-20 | 1957-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-19 | 1961-06-20 | 1961-12-20 | $7700.00 | Window Closed / Lapsed |