Patent US2741618A successfully refreshed from Google Patents.
US2741618A
Expired / Lapsed
US
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Production of pyridine bases and catalyst therefor
Assignee: Union Carbide Corp
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Filing: 1953-01-27
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Granted: 1956-04-10
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Expires: 1973-01-27
Abstract
No abstract record available.
Inventors
- 👤 Frank G Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:48
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06; C07D213/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
PROCESS FOR THE PRODUCTION OF PYRIDINE, WHICH COMPRISES CONTACTING A VAPOROUS MIXTURE COMPRISING A 2-ALKOXY-3,4-DIHYDRO-2H-PYRAN, AMMONIA, STEAM AND ADDED HYDROGEN WITH A SOLID CATALYST COMPRISING A SUBSTANTIALLY ALKALI-FREE ACTIVATED ALUMINA, COPPER, CHROMIUM AND AN ALKALI METAL SULFATE, AT A TEMPERATURE WITHIN THE RANGE BETWEEN ABOUT 200* C. AND ABOUT 350* C., SAID VAPOROUS MIXTURE COMPRISING BETWEEN 1 AND 8 MOLS OF AMMONIA, BETWEEN 8 AND 24 MOLS OF STEAM, AND BETWEEN 1 AND 10 MOLS OF HYDROGEN, PER MOL OF THE 2-ALKOXY-3,4DIHYDRO-2H-PYRAN.
Claim 2
Dependent Claim
82 words
PROCESS FOR THE PRODUCTION OF PYRIDINE, WHICH COMPRISES CONTACTING A VAPOROUS MIXTURE COMPRISING A 2-ALKOXY-3,4-DIHYDRO-2H-PYRAN, AMMONIA, STEAM AND ADDED HYDROGEN WITH A SOLID CATALYST COMPRISING A SUBSTANTIALLY ALKALI-FREE ACTIVATED ALUMINA, COPPER, CHROMIUM AND AN ALKALI METAL SULFATE, AT A TEMPERATURE WITHIN THE RANGE BETWEEN ABOUT 200* C. AND ABOUT 350* C., SAID VAPOROUS MIXTURE COMPRISING BETWEEN 1 AND 8 MOLS OF AMMONIA, BETWEEN 8 AND 24 MOLS OF STEAM, AND BETWEEN 1 AND 10 MOLS OF HYDROGEN, PER MOL OF THE 2-ALKOXY-3,4DIHYDRO-2H-PYRAN.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-10 | 1959-10-10 | 1960-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-10 | 1963-10-10 | 1964-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-10 | 1967-10-10 | 1968-04-10 | $7700.00 | Window Closed / Lapsed |