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US3573306A
Expired / Lapsed
US
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Process for preparation of n-substituted 3,5-diamino-6-halopyrazinamides
Assignee: Merck and Co Inc
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Filing: 1969-03-05
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Granted: 1971-03-30
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Expires: 1989-03-05
Abstract
Abstract A NEW PROCESS IS DESCRIBED FOR THE PREPARATION OF NSUBSTITUTED-3,5-DIAMINO-6-HALOPYRAZINAMIDES WHICH COMPRISES TREATING AN AMINO COMPOUND WITH A NOVEL, VERY REACTIVE ACYLATING COMPOUND, 3,5-DIAMINO-6-HALOPYRAZINCARBOXYLIC N,N-DIPHENYLCARBAMIC ANHYDRIDE. THE PRODUCTS OF THE NEW PROCESS HAVE UTILITY AS DILURETIC AGENTS.
Inventors
- 👤 Kenneth L Shepard
- 👤 Edward J Cragoe Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:42
CPC Classifications
C; C07; C07D; C07D241/00; C07D241/02; C07D241/10; C07D241/14; C07D241/24; C07D241/26
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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |