Patent US3816593A successfully refreshed from Google Patents.
US2775596A
Expired / Lapsed
US
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Production of substituted pyridines
Assignee: Phillips Petroleum Co
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Filing: 1952-10-20
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Granted: 1956-12-25
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Expires: 1972-10-20
Abstract
No abstract record available.
Inventors
- 👤 John E Mahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:56
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
IN A PROCESS FOR PRODUCING PYRIDINE DERIVATIVES BY THE INTERACTION OF CARBONYL COMPOUND WITH AMMONIA, THE IMPROVEMENT WHICH COMPRISES EFFECTING THE REACTION IN THE PRESENCE OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ANTIMONY FLUORIDE, COPPER FLUORIDE, BISMUTH FLUORIDE, ZINC FLUORIDE, IRON FLUORIDE, AND BARIUM FLUORIDE.
Claim 2
Dependent Claim
47 words
IN A PROCESS FOR PRODUCING PYRIDINE DERIVATIVES BY THE INTERACTION OF CARBONYL COMPOUND WITH AMMONIA, THE IMPROVEMENT WHICH COMPRISES EFFECTING THE REACTION IN THE PRESENCE OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ANTIMONY FLUORIDE, COPPER FLUORIDE, BISMUTH FLUORIDE, ZINC FLUORIDE, IRON FLUORIDE, AND BARIUM FLUORIDE.
References Cited (Backward Citations)
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Cited
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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) | 1959-12-25 | 1960-06-25 | 1960-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-25 | 1964-06-25 | 1964-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-25 | 1968-06-25 | 1968-12-25 | $7700.00 | Window Closed / Lapsed |