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US3803145A
Expired / Lapsed
US
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Quinoxaline-di-n-oxides
Assignee: Pfizer Inc
•
Filing: 1970-02-05
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Granted: 1974-04-09
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Expires: 1990-02-05
Abstract
Abstract 2-SUBSTITUTED-3-SULFINYL- AND SULFONYL-QUINOXALINE-DI-NOXIDES, PREPARED FROM THE CORRESPONDING 3-THIOQUINOXALINE-DI-N-OXIDES, AND THEIR NOVEL CONVERSION TO 2-SUBSTITUTED-3-HALOQUINOXAKINE-DI-N-OXIDES USING AQUEOUS SOLUTIONS OF THE APPROPRIATE HYDROGEN HALIDE AT TEMPERATURES OF 25-110*C.
Inventors
- 👤 Abushanab Elie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:05
CPC Classifications
C; C07; C07D; C07D241/00; C07D241/36; C07D241/50; C07D241/52
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) | 1977-04-08 | 1977-10-08 | 1978-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-08 | 1981-10-08 | 1982-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-08 | 1985-10-08 | 1986-04-09 | $7700.00 | Window Closed / Lapsed |