Patent US3752813A successfully refreshed from Google Patents.
US3752813A
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US
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Ortho hydroxy dihydro phenozine carboxylic acids and derivatives
Assignee: Merck and Co Inc
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Filing: 1971-08-02
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Granted: 1973-08-14
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Expires: 1991-08-02
Abstract
Abstract THIS INVENTION RELATES TO NEW TRICYCLIC CARBOXYLIC ACID AND ESTER DERIVATIVES AND PROCESSES FOR THEIR PREPARATION. THESE COMPOUNDS HAVE ANTI-INFLAMMATORY, ANTI-PYRETIC AND ANALGESIC ACTIVITY. ALSO INCLUDED ARE METHODS FOR PREPARING SAID CARBOXYLIC ACID COMPOUNDS.
Inventors
- 👤 B Witzel
- 👤 G Walford
- 👤 T Shen
- 👤 R Greenwald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:35
CPC Classifications
C; C07; C07C; C07C205/00; C07C205/49; C07C205/57; C07C205/61; C07C205/27; C07C205/34; C07C205/35; C07C205/36; C07C205/38; C07C205/45; C07C45/00; C07C45/45; C07C45/46; C07C49/00; C07C49/76; C07C49/80; C07C49/813; C07C66/00; C07C66/02
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |