Patent US2586808A successfully refreshed from Google Patents.
US2586808A
Expired / Lapsed
US
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Nicotinic acid production
Assignee: General Cigar Co Inc
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Filing: 1947-11-01
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Granted: 1952-02-26
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Expires: 1967-11-01
Abstract
No abstract record available.
Inventors
- 👤 Walter G Frankenburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:50
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/78; C07D213/79; C07D213/803
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
IN THE CONVERSION OF TOBACCO NICOTINE TO NICOTINIC ACID, THE IMPROVEMENT WHICH COMPRISES REACTING SAID NICOTINE WHILE STILL IN THE TOBACCO WITH AN OXYGEN-CONTAINING GAS AND MOISTURE AT A TEMPERATURE EFFECTING SIMULTANEOUSLY FERMENTATION OF SAID TOBACCO, CONTINUING THE REACTION AND SIMULTANEOUS FERMENTATION UNTIL SAID NICOTINE
Claim 2
Dependent Claim
45 words
IN THE CONVERSION OF TOBACCO NICOTINE TO NICOTINIC ACID, THE IMPROVEMENT WHICH COMPRISES REACTING SAID NICOTINE WHILE STILL IN THE TOBACCO WITH AN OXYGEN-CONTAINING GAS AND MOISTURE AT A TEMPERATURE EFFECTING SIMULTANEOUSLY FERMENTATION OF SAID TOBACCO, CONTINUING THE REACTION AND SIMULTANEOUS FERMENTATION UNTIL SAID NICOTINE
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) | 1955-02-25 | 1955-08-27 | 1956-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-25 | 1959-08-27 | 1960-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-25 | 1963-08-27 | 1964-02-26 | $7700.00 | Window Closed / Lapsed |