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US2877271A
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Preparation of ionones by cyclization of pseudoionones with sulfuric acid
Assignee: F Hoffmann La Roche AG
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Filing: 1957-11-27
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Granted: 1959-03-10
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Expires: 1977-11-27
Abstract
No abstract record available.
Inventors
- 👤 Kaiser Solomon
- 👤 Kimel Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:04
CPC Classifications
C; C07; C07C; C07C403/00; C07C403/14; C07C403/16; C07C2601/00; C07C2601/12; C07C2601/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
IN A PROCESS FOR THE PREPARATION OF NUCLEARLY UNSATURATED IONONES BY THE CYCLIZATION OF A PSEUDOIONONE WITH AN ACIDIC CYCLIZING AGENT, THE IMPROVEMENT WHICH COMPRISES EFFECTING THE CYCLIZATION REACTION IN A LIQUID, SUBSTANTIALLY ENTIRELY SATURATED, HYDROCARBON MEDIUM WHEREIN SULFURIC ACID IS THE SOLE ACIDIC CYCLIZING AGENT PRESENT.
Claim 2
Dependent Claim
47 words
IN A PROCESS FOR THE PREPARATION OF NUCLEARLY UNSATURATED IONONES BY THE CYCLIZATION OF A PSEUDOIONONE WITH AN ACIDIC CYCLIZING AGENT, THE IMPROVEMENT WHICH COMPRISES EFFECTING THE CYCLIZATION REACTION IN A LIQUID, SUBSTANTIALLY ENTIRELY SATURATED, HYDROCARBON MEDIUM WHEREIN SULFURIC ACID IS THE SOLE ACIDIC CYCLIZING AGENT PRESENT.
References Cited (Backward Citations)
US2636052A
Cited
US652969A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-09 | 1962-09-08 | 1963-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-09 | 1966-09-08 | 1967-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-09 | 1970-09-08 | 1971-03-10 | $7700.00 | Window Closed / Lapsed |