Patent US3410850A successfully refreshed from Google Patents.
US3410850A
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US
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4h-pyrazino-[2, 3d][1, 3]oxazin-4-ones and their preparation
Assignee: Merck and Co Inc
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Filing: 1965-11-22
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Granted: 1968-11-12
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Expires: 1985-11-22
Abstract
No abstract record available.
Inventors
- 👤 Jr Edward J Cragoe
- 👤 John B Bicking
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:33
CPC Classifications
C; C07; C07D; C07D475/00; C07D475/02; 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) | 1971-11-12 | 1972-05-13 | 1972-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-12 | 1976-05-13 | 1976-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-12 | 1980-05-13 | 1980-11-12 | $7700.00 | Window Closed / Lapsed |