US3382282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for 2-lower alkyl cyclopentane-1, 3-diones
Assignee: Merck and Co Inc
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Filing: 1964-10-16
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Granted: 1968-05-07
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Expires: 1984-10-16
Abstract
No abstract record available.
Inventors
- 👤 Victor J Grenda
- 👤 Norman L Wendler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:21
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/45
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A PROCESS WHICH COMPRISES REACTING SUCCINIC ANHYDRIDE WITH AN ENOL LOWER HYDROCARBON ALKANOATE OF A LOWER ALKANONE CONTAINING FROM FOUR TO EIGHT CARBON ATOMS IN THE PRESENCE OF ALUMINUM CHLORIDE AT A TEMPERATURE FROM ABOUT 30*C. TO ABOUT 110*C. AND QUENCHING THE REACTION MIXTURE WITH AQUEOUS ACID TO PRODUCE A 2LOWER ALKYL SUBSTITUTED CYCLOPENTANE-1,3-DIONE.
Claim 2
Dependent Claim
54 words
A PROCESS WHICH COMPRISES REACTING SUCCINIC ANHYDRIDE WITH AN ENOL LOWER HYDROCARBON ALKANOATE OF A LOWER ALKANONE CONTAINING FROM FOUR TO EIGHT CARBON ATOMS IN THE PRESENCE OF ALUMINUM CHLORIDE AT A TEMPERATURE FROM ABOUT 30*C. TO ABOUT 110*C. AND QUENCHING THE REACTION MIXTURE WITH AQUEOUS ACID TO PRODUCE A 2LOWER ALKYL SUBSTITUTED CYCLOPENTANE-1,3-DIONE.
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) | 1971-05-07 | 1971-11-06 | 1972-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-07 | 1975-11-06 | 1976-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-07 | 1979-11-06 | 1980-05-07 | $7700.00 | Window Closed / Lapsed |