Patent US2845431A successfully refreshed from Google Patents.
US2845431A
Expired / Lapsed
US
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Alkyl-piperidiones and process for the manufacture thereof
Assignee: F Hoffmann La Roche AG
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Filing: 1956-10-23
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Granted: 1958-07-29
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Expires: 1976-10-23
Abstract
No abstract record available.
Inventors
- 👤 Lutz August Hans
- 👤 Schnider Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:30
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/62; C07D213/69
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
A PROCESS WHICH COMPRISES REACTING BELOW 70*C. A TETRAHYDROPYRIDIONE OF THE GENERAL FORMULA
Claim 2
Dependent Claim
13 words
A PROCESS WHICH COMPRISES REACTING BELOW 70*C. A TETRAHYDROPYRIDIONE OF THE GENERAL FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-28 | 1962-01-27 | 1962-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-28 | 1966-01-27 | 1966-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-28 | 1970-01-27 | 1970-07-29 | $7700.00 | Window Closed / Lapsed |