Patent US2546652A successfully refreshed from Google Patents.
US2546652A
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Pyridindenes and process for their manufacture
Assignee: F Hoffmann La Roche AG
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Filing: 1949-07-30
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Granted: 1951-03-27
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Expires: 1969-07-30
Abstract
No abstract record available.
Inventors
- 👤 Plati John Thomas
- 👤 Wenner Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:06
CPC Classifications
C; C07; C07D; C07D221/00; C07D221/02; C07D221/04; C07D221/06; C07D221/16; C07D211/00; C07D211/04; C07D211/06; C07D211/36; C07D211/60
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
56 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF A 2-LOWER ALKYL-9-KETO-2,3,4,4A,9,9AHEXAHYDRO-1-PYRIDINDENE, A 2-LOWER ALKYL-9-HYDROXY - 9 - PHENYL-2,3,4,4A,9,9A-HEXAHYDRO-1-PYRIDINDENE, A 2 - LOWER ALKYL - 9 - HYDROXY - 9 - TOLYL2,3,4,4A,9,9A-HEXAHYDRO-1-PYRIDINDENE, A 2-LOWER ALKYL - 9 - HYDROXY - 9 - (METHOXY - PHENYL) 2,3, 4,4A,9,9A-HEXAHYDRO-1-PYRIDINDENE, A 2-LOWER ALKYL-9-HYDROXY-9-PYRIDYL - 2,3,4,4A,9,9A-HEXAHYDRO-1-PYRIDINDENE, AND THEIR ACID ADDITION SALTS.
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) | 1954-03-26 | 1954-09-25 | 1955-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-26 | 1958-09-25 | 1959-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-26 | 1962-09-25 | 1963-03-27 | $7700.00 | Window Closed / Lapsed |