US3911026A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthesis of hydroxycyclopenten-1-ones
Assignee: F Hoffmann La Roche AG
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Filing: 1973-08-20
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Granted: 1975-10-07
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Expires: 1993-08-20
Abstract
Abstract This invention relates to a process for the preparation of 2alkenyl-4-hydroxy-3-methyl-2-cyclopenten-1-ones from a 2-alkenyl or 2-alkynyl-3-methyl-2-cyclopenten-1-one and intermediates therein.
Inventors
- 👤 Richard Wightman Kierstead
- 👤 Ronald Andrew Lemahieu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:15
CPC Classifications
C; C07; C07C; C07C35/00; C07C35/02; C07C35/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
5 words
A COMPOUND OF THE FORMULA:
Claim 2
Dependent Claim
5 words
A COMPOUND OF THE FORMULA:
Claim 3
Dependent Claim
11 words
A compound according to claim 1 wherein said compound is 2-(2''-cis-butenyl)-3-methyl-2-cyclopenten-1-ol.
Claim 4
Dependent Claim
11 words
A compound according to claim 1 wherein said compound is 2-(2''-propenyl)-3-methyl-2-cyclopenten-1-ol.
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) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |