US2851461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of heterocylic nitrogen compounds
Assignee: Ansul Chemical Co
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Filing: 1956-06-04
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Granted: 1958-09-09
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Expires: 1976-06-04
Abstract
No abstract record available.
Inventors
- 👤 Robert J Zellner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:32
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06; C07D213/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A PROCESS FOR THE SYNTHESIS OF 3,5-DIALKYLPYRIDINES WHICH COMPRISES PASSING A MIXTURE OF A SATURATED ALIPHATIC ALCOHOL OF AT LEAST 3 CARBON ATOMS, FORMALDEHYDE AND AMMONIA OVER A SILICA-ALUMINA CATALYST CONTAINING 10 TO 25 PERCENT BY WEIGHT OF ALUMINA AT A TEMPERATURE OF 250 TO 500*C. AND AT SUBSTANTIALLY ATMOSPHERIC PRESSURE.
Claim 2
Dependent Claim
51 words
A PROCESS FOR THE SYNTHESIS OF 3,5-DIALKYLPYRIDINES WHICH COMPRISES PASSING A MIXTURE OF A SATURATED ALIPHATIC ALCOHOL OF AT LEAST 3 CARBON ATOMS, FORMALDEHYDE AND AMMONIA OVER A SILICA-ALUMINA CATALYST CONTAINING 10 TO 25 PERCENT BY WEIGHT OF ALUMINA AT A TEMPERATURE OF 250 TO 500*C. AND AT SUBSTANTIALLY ATMOSPHERIC PRESSURE.
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) | 1961-09-08 | 1962-03-10 | 1962-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-08 | 1966-03-10 | 1966-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-08 | 1970-03-10 | 1970-09-09 | $7700.00 | Window Closed / Lapsed |