Patent US2819316A successfully refreshed from Google Patents.
US2819316A
Expired / Lapsed
US
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Synthesis of vitamin a isomers
Assignee: Ortho Pharmaceutical Corp
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Filing: 1953-03-20
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Granted: 1958-01-07
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Expires: 1973-03-20
Abstract
No abstract record available.
Inventors
- 👤 Oroshnik William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:27
CPC Classifications
C; C07; C07C; C07C401/00; C07C2601/00; C07C2601/12; C07C2601/16; C07C2602/00; C07C2602/02; C07C2602/14; C07C2602/24
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
9 words
THE METHOD COMPRISING TREATING A COMPOUND OF THE FORMULA
References Cited (Backward Citations)
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Cited
US1202282A
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US1896162A
Cited
US2410575A
Cited
US2445627A
Cited
US2475139A
Cited
US2587457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |