US2615922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthesis of vitamin a and intermediates therefor
Assignee: GAF Chemicals Corp
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Filing: 1949-12-17
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Granted: 1952-10-28
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Expires: 1969-12-17
Abstract
No abstract record available.
Inventors
- 👤 Jr Albert Carl Starke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:32
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: 2
Claim 1
Independent Claim
25 words
IN A PROCESS FOR THE SYNTHESIS OF VITAMIN A OR OF AN INTERMEDIATE THEREFOR, THE STEPS WHICH COMPRISE REACTING A KETONE HAVING THE FOLLOWING FORMULA:
Claim 2
Dependent Claim
25 words
IN A PROCESS FOR THE SYNTHESIS OF VITAMIN A OR OF AN INTERMEDIATE THEREFOR, THE STEPS WHICH COMPRISE REACTING A KETONE HAVING THE FOLLOWING FORMULA:
References Cited (Backward Citations)
FR744344A
Cited
US2487525A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-28 | 1956-04-28 | 1956-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-28 | 1960-04-28 | 1960-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-28 | 1964-04-28 | 1964-10-28 | $7700.00 | Window Closed / Lapsed |