US2654738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organic derivatives of phosphonic acids and method of preparing the same
Assignee: Wyeth Holdings LLC
•
Filing: 1952-08-02
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Granted: 1953-10-06
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Expires: 1972-08-02
Abstract
No abstract record available.
Inventors
- 👤 Hans Z Lecher
- 👤 Kuh Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:41
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/553; C07F9/564
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
COMPOUNDS OF THE GROUP HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
8 words
COMPOUNDS OF THE GROUP HAVING THE GENERAL FORMULA:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-05 | 1957-04-06 | 1957-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-05 | 1961-04-06 | 1961-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-05 | 1965-04-06 | 1965-10-06 | $7700.00 | Window Closed / Lapsed |