Patent US2583194A successfully refreshed from Google Patents.
US2583194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vitamin a derivatives and methods of preparing the same
Assignee: Eastman Kodak Co
•
Filing: 1948-04-27
•
Granted: 1952-01-22
•
Expires: 1968-04-27
Abstract
No abstract record available.
Inventors
- 👤 Weisler Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:00
CPC Classifications
C; C07; C07C; C07C403/00; C07C403/20; C07C403/18; C07C2601/00; C07C2601/12; C07C2601/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
22 words
THE METHOD OF MAKING A POLYENE AMINE WHICH COMPRISES REFLUXING IN GLACIAL ACETIC ACID, A MEMBER SELECTED FROM THE GROUP CONSISTING OF
References Cited (Backward Citations)
US2381882A
Cited
US2176018A
Cited
US2150154A
Cited
US2369158A
Cited
US2414722A
Cited
US2415834A
Cited
US2432921A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-21 | 1955-07-23 | 1956-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-21 | 1959-07-23 | 1960-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-21 | 1963-07-23 | 1964-01-22 | $7700.00 | Window Closed / Lapsed |