US2611769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of vinyl pyridines
Assignee: Hercules Powder Co
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Filing: 1947-08-02
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Granted: 1952-09-23
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Expires: 1967-08-02
Abstract
No abstract record available.
Inventors
- 👤 John T Hays
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:54
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
THE PROCESS OF PREPARING A VINYL SUBSTITUTED PYRIDINE COMPOUND WHICH COMPRISES PASSING AN ETHYL SUBSTITUTED PYRIDINE OVER AN ACTIVE HIGH TEMPERATURE DEHYDROGENATION CATALYST AT A TEMPERATURE BETWEEN ABOUT 450* C. AND ABOUT 800* C., AND FRACTIONALLY CRYSTALLIZING THE RESULTING REACTION MIXTURE COMPRISING THE VINYL SUBSTITUTED PYRIDINE COMPOUND AND THE UNCHANGED ETHYL SUBSTITUTED PYRIDINE COMPOUND FROM A LOW BOILING PETROLEUM HYDROCARBON SOLVENT AT A TEMPERATURE BETWEEN ABOUT -30* C. AND ABOUT -70* C.
Claim 2
Dependent Claim
72 words
THE PROCESS OF PREPARING A VINYL SUBSTITUTED PYRIDINE COMPOUND WHICH COMPRISES PASSING AN ETHYL SUBSTITUTED PYRIDINE OVER AN ACTIVE HIGH TEMPERATURE DEHYDROGENATION CATALYST AT A TEMPERATURE BETWEEN ABOUT 450* C. AND ABOUT 800* C., AND FRACTIONALLY CRYSTALLIZING THE RESULTING REACTION MIXTURE COMPRISING THE VINYL SUBSTITUTED PYRIDINE COMPOUND AND THE UNCHANGED ETHYL SUBSTITUTED PYRIDINE COMPOUND FROM A LOW BOILING PETROLEUM HYDROCARBON SOLVENT AT A TEMPERATURE BETWEEN ABOUT -30* C. AND ABOUT -70* C.
References Cited (Backward Citations)
US2402158A
Cited
AT132042B
Cited
US2141611A
Cited
FR849126A
Cited
US2300971A
Cited
US2376709A
Cited
US2376532A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-23 | 1956-03-24 | 1956-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-23 | 1960-03-24 | 1960-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-23 | 1964-03-24 | 1964-09-23 | $7700.00 | Window Closed / Lapsed |