US2865962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of 3-methyl-1, 2-cyclopentanedione
Assignee: International Minerals and Chemical Corp
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Filing: 1957-11-20
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Granted: 1958-12-23
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Expires: 1977-11-20
Abstract
No abstract record available.
Inventors
- 👤 Lewis I Krimen
- 👤 Oscar L Norman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:34
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/61; C07C45/67; C07C45/673
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
A METHOD FOR SYNTHESIZING 3-METHYL-1,2-CYCLOPENTANEDIONE WHICH COMPRISES COMMINGLING AS ALKYL ACRYLATE WITH AN ALKALI-METAL SALT OF AN ALKYL ALKOXALYLPROPIONATE UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS, ALLOWING THE RESULTING REACTION PRODUCT TO CYCLIZE, AND HYDROLYZING AND DECARBOXYLATING THE RESULTING CYCLIC COMPOUND, WHEREBY 3-METHYL-1,2-CYCLOPENTANEDIONE IS OBTAINED.
Claim 2
Independent Claim
42 words
A METHOD FOR SYNTHESIZING 3-METHYL-1,2-CYCLOPENTANEDIONE WHICH COMPRISES COMMINGLING AS ALKYL ACRYLATE WITH AN ALKALI-METAL SALT OF AN ALKYL ALKOXALYLPROPIONATE UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS, ALLOWING THE RESULTING REACTION PRODUCT TO CYCLIZE, AND HYDROLYZING AND DECARBOXYLATING THE RESULTING CYCLIC COMPOUND, WHEREBY 3-METHYL-1,2-CYCLOPENTANEDIONE IS OBTAINED.
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) | 1961-12-22 | 1962-06-23 | 1962-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-22 | 1966-06-23 | 1966-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-22 | 1970-06-23 | 1970-12-23 | $7700.00 | Window Closed / Lapsed |