Patent US2916509A successfully refreshed from Google Patents.
US2916509A
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Phosphonic acid derivatives
Assignee: Bayer AG
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Filing: 1957-08-14
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Granted: 1959-12-08
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Expires: 1977-08-14
Abstract
No abstract record available.
Inventors
- 👤 Schegk Ernst
- 👤 Schrader Gerhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:50
CPC Classifications
A; A01; A01N; A01N57/00; A01N57/18; A01N57/22; C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4071; C07F9/4084
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
A PHOSPHONIC ACID ESTERS OF THE FOLLOWING FORMULA
Claim 2
Dependent Claim
8 words
A PHOSPHONIC ACID ESTERS OF THE FOLLOWING FORMULA
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) | 1962-12-07 | 1963-06-08 | 1963-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-07 | 1967-06-08 | 1967-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-07 | 1971-06-08 | 1971-12-08 | $7700.00 | Window Closed / Lapsed |