US2661374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthesis of 4-hydroxy-2-cyclo-penten-1-ones
Assignee: Individual
•
Filing: 1949-02-08
•
Granted: 1953-12-01
•
Expires: 1969-02-08
Abstract
No abstract record available.
Inventors
- 👤 Milton S Schechter
- 👤 Forge Frederick B La
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:06
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/587; C07C49/703; C07C49/723; C07C45/00; C07C45/61; C07C45/65; C07C45/66; C07C45/67; C07C45/68; C07C45/72; C07C49/04; C07C49/17; C07C49/20; C07C49/203; C07C49/24; C07C49/707; C07C49/747; C07C49/76; C07C49/82; C07C49/835
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
9 words
A METHOD OF PREPARING A CYCLOPENTENOLONE OF THE FORMULA:
Claim 2
Independent Claim
9 words
A METHOD OF PREPARING A CYCLOPENTENOLONE OF THE FORMULA:
Claim 3
Dependent Claim
56 words
A 4-HYDROXY CYCLOPENTENONE OF THE GROUP CONSISTING OF 2-ALLYL - 4- HYDROXY - 3 - METHYL-2CYCLOPENTEN - 1 - ONE; 4-HYDROXY - 3 - METHYL-(2METHYLALLYL) - 2 - CYCLOPENTEN-1-ONE; SYNTHETIC RACEMIC 2-(2 - BUTENYL) - 4 - HYDROXY-3-METHYL2-CYCLOPENTEN-1-ONE, THE SEMICARBAZONE OF WHICH HAS A MELTING POINT WITH DECOMPOSITION AT ABOUT 222-223* C.; 2-(3-BUTENYL)-4-HYDROXY-3-METHYL2-CYCLOPENTEN-1-ONE; 4-HYDROXY-3-METHYL-2-(3METHYL-2-BUTENYL)-2-CYCLOPENTEN-1-ONE; AND 2ALLYL-4-HYDROXY-3-PHENYL-2-CYCLOPENTEN-1-ONE.
Claim 4
Dependent Claim
56 words
A 4-HYDROXY CYCLOPENTENONE OF THE GROUP CONSISTING OF 2-ALLYL - 4- HYDROXY - 3 - METHYL-2CYCLOPENTEN - 1 - ONE; 4-HYDROXY - 3 - METHYL-(2METHYLALLYL) - 2 - CYCLOPENTEN-1-ONE; SYNTHETIC RACEMIC 2-(2 - BUTENYL) - 4 - HYDROXY-3-METHYL2-CYCLOPENTEN-1-ONE, THE SEMICARBAZONE OF WHICH HAS A MELTING POINT WITH DECOMPOSITION AT ABOUT 222-223* C.; 2-(3-BUTENYL)-4-HYDROXY-3-METHYL2-CYCLOPENTEN-1-ONE; 4-HYDROXY-3-METHYL-2-(3METHYL-2-BUTENYL)-2-CYCLOPENTEN-1-ONE; AND 2ALLYL-4-HYDROXY-3-PHENYL-2-CYCLOPENTEN-1-ONE.
References Cited (Backward Citations)
US2096715A
Cited
US2387587A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-30 | 1957-06-01 | 1957-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-30 | 1961-06-01 | 1961-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-30 | 1965-06-01 | 1965-12-01 | $7700.00 | Window Closed / Lapsed |