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Patent US2834813A successfully refreshed from Google Patents.
US2834813A
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Synthesis of vitamin a
Assignee: Ortho Pharmaceutical Corp
•
Filing: 1953-04-21
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Granted: 1958-05-13
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Expires: 1973-04-21
Abstract
No abstract record available.
Inventors
- 👤 Oroshnik William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:08
CPC Classifications
C; C07; C07C; C07C403/00; C07C403/06; C07C403/08; C07C403/10; C07C403/12; C07C2601/00; C07C2601/12; C07C2601/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
19 words
A PROCESS FOR THE SYNTHESIS OF COMPOUNDS HAVING VITAMIN A ACTIVITY WHICH COMPRISES TREATING A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
19 words
A PROCESS FOR THE SYNTHESIS OF COMPOUNDS HAVING VITAMIN A ACTIVITY WHICH COMPRISES TREATING A COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 4
Dependent Claim
5 words
A COMPOUND OF THE FORMULA
References Cited (Backward Citations)
US2602092A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-12 | 1961-11-11 | 1962-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-12 | 1965-11-11 | 1966-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-12 | 1969-11-11 | 1970-05-13 | $7700.00 | Window Closed / Lapsed |