US2549651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyridine preparation
Assignee: Hercules Powder Co
•
Filing: 1948-08-19
•
Granted: 1951-04-17
•
Expires: 1968-08-19
Abstract
No abstract record available.
Inventors
- 👤 Cyrus A Weisgerber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:11
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06; C07D213/08; C07D213/09; C07D213/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
THE PROCESS OF PREPARING A PYRIDINE WHICH COMPRISES REACTING IN THE VAPOR PHASE AND IN THE PRESENCE OF AN ALUMIUM OXIDE CATALYST, A CONJUGATED DIOLEFIN HYDROCARBON AND AN ALKYL NITRILE.
Claim 2
Dependent Claim
30 words
THE PROCESS OF PREPARING A PYRIDINE WHICH COMPRISES REACTING IN THE VAPOR PHASE AND IN THE PRESENCE OF AN ALUMIUM OXIDE CATALYST, A CONJUGATED DIOLEFIN HYDROCARBON AND AN ALKYL NITRILE.
References Cited (Backward Citations)
US2447600A
Cited
US2433182A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-16 | 1954-10-16 | 1955-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-16 | 1958-10-16 | 1959-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-16 | 1962-10-16 | 1963-04-17 | $7700.00 | Window Closed / Lapsed |