Patent US3689480A successfully refreshed from Google Patents.
US3689480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphanilic acid derivatives
Assignee: Merck and Co Inc
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Filing: 1969-08-05
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Granted: 1972-09-05
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Expires: 1989-08-05
Abstract
Abstract FLUORO SUBSTITUTED PHOSPHANILIC AMIDES ARE PRODUCED BY REDUCTION OF THE CORRESPONDING FLUORO-NITROBENZENEPHOSPHONAMIDE. THE NITROBENZENEPHOSPHONAMIDES MAY BE PREPARED FROM THE PHOSPHONIC DIHALIDE BY REACTION OF THE DIHALIDE WITH AN AMINE. THE PHOSPHONIC DIHALIDE MAY BE PREPARED FROM THE CORRESPONDING FLUORO-SUBSTITUTED PHOSPHONIC ACID BY REACTION WITH A HALOGENATING AGENT. THE FLUORO-PHOSPHANILIC AMIDES ARE USEFUL AS ANTI-BACTERIAL AGENTS.
Inventors
- 👤 Burton G Christensen
- 👤 William J Leanza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:08
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/44; C07F9/4403; C07F9/4419
Claims Analysis
Total Claims: 0
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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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |