US2586305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthesis of vitamin a and intermediates therefor
Assignee: GAF Chemicals Corp
•
Filing: 1949-10-26
•
Granted: 1952-02-19
•
Expires: 1969-10-26
Abstract
No abstract record available.
Inventors
- 👤 Copenhaver John William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:16
CPC Classifications
C; C07; C07C; C07C403/00; C07C403/06; C07C403/08; C07C403/10; C07C403/14; C07C2601/00; C07C2601/12; C07C2601/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
63 words
IN A PROCESS FOR THE SYNTHESIS OF VITAMIN A OR OF AN INTERMEDIATE THEREFOR, THE STEPS WHICH COMPRISE REACTING BETA-IONONE WITH AN ORTHOCARBOXYLIC ACID ESTER TO FORM A BETA-IONONE KETAL, CONDENSING THE RESULTING KETAL SUCCESSIVELY WITH 1 MOLECULE OF A VINYL ETHER, 1 MOLECULE OF AN ISOPROPENYL ETHER AND 1 MOLECULE OF A VINYL ETHER, TO FORM A POLYETHER ACETAL HAVING THE FORMULA:
Claim 2
Dependent Claim
63 words
IN A PROCESS FOR THE SYNTHESIS OF VITAMIN A OR OF AN INTERMEDIATE THEREFOR, THE STEPS WHICH COMPRISE REACTING BETA-IONONE WITH AN ORTHOCARBOXYLIC ACID ESTER TO FORM A BETA-IONONE KETAL, CONDENSING THE RESULTING KETAL SUCCESSIVELY WITH 1 MOLECULE OF A VINYL ETHER, 1 MOLECULE OF AN ISOPROPENYL ETHER AND 1 MOLECULE OF A VINYL ETHER, TO FORM A POLYETHER ACETAL HAVING THE FORMULA:
Claim 3
Dependent Claim
6 words
A COMPOUND OF THE GENERAL FORMULA:
Claim 4
Dependent Claim
6 words
A COMPOUND OF THE GENERAL FORMULA:
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) | 1955-02-18 | 1955-08-20 | 1956-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-18 | 1959-08-20 | 1960-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-18 | 1963-08-20 | 1964-02-19 | $7700.00 | Window Closed / Lapsed |