Patent US3617072A successfully refreshed from Google Patents.
US2576104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dehydration and isomerization of straight-chain-conjugated polyene esters and acids
Assignee: Eastman Kodak Co
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Filing: 1947-09-09
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Granted: 1951-11-27
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Expires: 1967-09-09
Abstract
No abstract record available.
Inventors
- 👤 Edgar M Shantz
- 👤 Charles D Robeson
- 👤 Henry M Kascher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:22
CPC Classifications
C; C07; C07C; C07C403/00; C07C403/06; C07C403/08; C07C403/14; C07C403/16; C07C403/20; C07C2601/00; C07C2601/12; C07C2601/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
14 words
THE PROCESS OF PREPARING IN GOOD YIELD AN A,B-UNSATURATED POLYENE COMPOUND HAVING THE FORMULA
Claim 2
Dependent Claim
14 words
THE PROCESS OF PREPARING IN GOOD YIELD AN A,B-UNSATURATED POLYENE COMPOUND HAVING THE FORMULA
Claim 3
Dependent Claim
145 words
THE PROCESS OF PREPARING VITAMIN A IN IMPROVED YIELD WHICH COMPRISES CONVERTING B-IONONE TO B-IONALACETIC ACID ESTER, TREATING SAID B-IONOLACETIC ACID ESTER WITH AN ACIDIC MATERIAL AND THEREBY PRODUCING A MIXTURE OF B-IONYLIDENE ACETIC ACID ESTER AND A STRUCTURAL ISOMER THEREOF, SAID TREATING BEING CONTINUED UNTIL SAID MIXTURE COMPRISES SUBSTANTIALLY EQUILIBRIUM PROPORTIONS OF SAID B-IONYLIDENE ACETIC ACID ESTER AND SAID STRUCTURAL ISOMER THEREOF, SEPARATING SAID STRUCTURAL ISOMER FROM SAID B-IONYLIDENE ACETIC ACID ESTER, ISOMERIZING SAID SEPARATED STRUCTURAL ISOMER BY TREATING SAID ISOMER ADDITIONALLY WITH AN ACIDIC MATERIAL AND THEREBY CONVERTING A SUBSTANTIAL PORTION OF SAID STRUCTURAL ISOMER TO SAID B-IONYLIDENE ACETIC ACID ESTER, SAID SEPARATING AND ISOMERIZING BEING REPEATED UNTIL A MAJOR PROPORTION OF SAID B-IONOLACETIC ACID ESTER IS CONVERTED TO SAID B-IONYLIDENE ACETIC ACID ESTER, REDUCING SAID B-IONYLIDENE ACETIC ACID ESTER TO B-IONYLIDENE ETHANOL, OXIDIZING SAID B-IONYLIDENE ETHANOL TO A KETONE OF THE FORMULA
Claim 4
Dependent Claim
145 words
THE PROCESS OF PREPARING VITAMIN A IN IMPROVED YIELD WHICH COMPRISES CONVERTING B-IONONE TO B-IONALACETIC ACID ESTER, TREATING SAID B-IONOLACETIC ACID ESTER WITH AN ACIDIC MATERIAL AND THEREBY PRODUCING A MIXTURE OF B-IONYLIDENE ACETIC ACID ESTER AND A STRUCTURAL ISOMER THEREOF, SAID TREATING BEING CONTINUED UNTIL SAID MIXTURE COMPRISES SUBSTANTIALLY EQUILIBRIUM PROPORTIONS OF SAID B-IONYLIDENE ACETIC ACID ESTER AND SAID STRUCTURAL ISOMER THEREOF, SEPARATING SAID STRUCTURAL ISOMER FROM SAID B-IONYLIDENE ACETIC ACID ESTER, ISOMERIZING SAID SEPARATED STRUCTURAL ISOMER BY TREATING SAID ISOMER ADDITIONALLY WITH AN ACIDIC MATERIAL AND THEREBY CONVERTING A SUBSTANTIAL PORTION OF SAID STRUCTURAL ISOMER TO SAID B-IONYLIDENE ACETIC ACID ESTER, SAID SEPARATING AND ISOMERIZING BEING REPEATED UNTIL A MAJOR PROPORTION OF SAID B-IONOLACETIC ACID ESTER IS CONVERTED TO SAID B-IONYLIDENE ACETIC ACID ESTER, REDUCING SAID B-IONYLIDENE ACETIC ACID ESTER TO B-IONYLIDENE ETHANOL, OXIDIZING SAID B-IONYLIDENE ETHANOL TO A KETONE OF THE FORMULA
References Cited (Backward Citations)
US2424994A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-26 | 1955-05-28 | 1955-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-26 | 1959-05-28 | 1959-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-26 | 1963-05-28 | 1963-11-27 | $7700.00 | Window Closed / Lapsed |