US3705171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of 2-substituted-5-amino or substituted amino-1,3,4-thiadiazoles
Assignee: Wyeth Holdings LLC
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Filing: 1970-05-18
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Granted: 1972-12-05
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Expires: 1990-05-18
Abstract
Abstract THE REACTION OF A SUBSTITUTED NITRILE WITH THIOSEMICARBAZIDE OR A SUBSTITUTED THIOSEMICARBAZIDE TO PRODUCE 2SUBSTITUTED - 5 - AMINO SUBSTITUTED AMINO - 1,3,4 - THIADIAZOLES IS DESCRIBED. THE COMPOUNDS PREPARED BY THE PRESENT INVENTION ARE USEFUL AS INTERMEDIATES IN PREPARING ANTIBACTERIAL AGENTS, SUCH AS SULFAMETHIZOLE.
Inventors
- 👤 Christos George Papaioannou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:59
CPC Classifications
C; C07; C07D; C07D285/00; C07D285/01; C07D285/02; C07D285/04; C07D285/12; C07D285/125; C07D285/135
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) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |