Patent US3658879A successfully refreshed from Google Patents.
US3658879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of chrysanthemic acid
Assignee: Rhone Poulenc SA
•
Filing: 1967-10-09
•
Granted: 1972-04-25
•
Expires: 1987-10-09
Abstract
Abstract CHRYSANTHEMIC ACID, ITS LOWER ALKYL ESTERS AND NITRILE ARE MADE BY DECARBOXYLATING AN ACID OF THE FORMULA: 1-(HOOC-),1-(R-OOC-),2-((CH3-)2-C=CH-),3,3-DI(CH3-)- CYCLOPROPANE OR 1-(HOOC-),1-(NC-),2-((CH3-)2-C=CH-),3,3-DI(CH3-)- CYCLOPROPANE
Inventors
- 👤 Marc Julia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:18
CPC Classifications
C; C07; C07C; C07C317/00; C07C317/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |