US2607781A
Expired / Lapsed
US
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Process for preparing alkyl isodehydroacetates employing sulfur trioxide
Assignee: Eastman Kodak Co
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Filing: 1951-03-29
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Granted: 1952-08-19
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Expires: 1971-03-29
Abstract
No abstract record available.
Inventors
- 👤 James M Straley
- 👤 Brice S Wininger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:58
CPC Classifications
C; C07; C07D; C07D309/00; C07D309/34; C07D309/36; C07D309/38
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
43 words
A PROCESS FOR PREPARING ETHYL ISODEHYDROACETATE COMPRISING CONDENSING ETHYL ACETOACETATE AT A TEMPERATURE OF FROM ABOUT -20* TO ABOUT 40* C. IN THE PRESENCE OF SULFUR TRIOXIDE AND AN ALCOHOL HAVING THE FORMULA CNH2N+1OH WHERE N REPRESENTS AN INTEGER FROM 1 TO 6.
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) | 1955-08-19 | 1956-02-18 | 1956-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-19 | 1960-02-18 | 1960-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-19 | 1964-02-18 | 1964-08-19 | $7700.00 | Window Closed / Lapsed |