US2934537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing pyridine and 3-picoline
Assignee: Individual
•
Filing: 1954-02-12
•
Granted: 1960-04-26
•
Expires: 1974-02-12
Abstract
No abstract record available.
Inventors
- 👤 Francis E Cislak
- 👤 William R Wheeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:01
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06; C07D213/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
THE PROCESS OF PREPARING PYRIDINE WHICH COMPRISES MIXING THE VAPORS OF ACETYLENE, AMMONIA, AND FORMALDEHYDE, PASSING THE RESULTANT MIXTURE THROUGH A REACTOR CONTAINING A CATALYST COMPRISING AN ACTIVATED ALUMINA IMPREGNATED WITH ZINC FLUORIDE MAINTAINED AT A TEMPERATURE BETWEEN ABOUT 400*C. AND ABOUT 500*C. AND RECOVERING PYRIDINE FROM THE REACTION PRODUCT.
Claim 2
Dependent Claim
50 words
THE PROCESS OF PREPARING PYRIDINE WHICH COMPRISES MIXING THE VAPORS OF ACETYLENE, AMMONIA, AND FORMALDEHYDE, PASSING THE RESULTANT MIXTURE THROUGH A REACTOR CONTAINING A CATALYST COMPRISING AN ACTIVATED ALUMINA IMPREGNATED WITH ZINC FLUORIDE MAINTAINED AT A TEMPERATURE BETWEEN ABOUT 400*C. AND ABOUT 500*C. AND RECOVERING PYRIDINE FROM THE REACTION PRODUCT.
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) | 1963-04-26 | 1963-10-26 | 1964-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-26 | 1967-10-26 | 1968-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-26 | 1971-10-26 | 1972-04-26 | $7700.00 | Window Closed / Lapsed |