Patent US5238734A successfully refreshed from Google Patents.
Patent US2689852A successfully refreshed from Google Patents.
US2689852A
Expired / Lapsed
US
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Pyridine derivatives
Assignee: F Hoffmann La Roche AG
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Filing: 1951-11-03
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Granted: 1954-09-21
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Expires: 1971-11-03
Abstract
No abstract record available.
Inventors
- 👤 Fox Herman Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:25
CPC Classifications
C; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/0475; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/78; C07D213/81; C01P; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
28 words
1- ISONICOTINYL - 2 - ACYL - HYDRAZINES, WHEREIN THE ACRY RADICAL IS A MEMBER OF THE CLASS CONSISTING OF ALKANOYL, CARBOXYALKANOYL, ALKENOYL, CARBOXALKENOYL, BENZOYL, AND CARBOXYBENZOYL RADICALS.
Claim 2
Dependent Claim
28 words
1- ISONICOTINYL - 2 - ACYL - HYDRAZINES, WHEREIN THE ACRY RADICAL IS A MEMBER OF THE CLASS CONSISTING OF ALKANOYL, CARBOXYALKANOYL, ALKENOYL, CARBOXALKENOYL, BENZOYL, AND CARBOXYBENZOYL RADICALS.
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) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |