US2623885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compounds of the cyclopentanopolyhydrophenanthrene series and process ofmaking same
Assignee: CIBA PHARM PROD Inc
•
Filing: 1949-11-07
•
Granted: 1952-12-30
•
Expires: 1969-11-07
Abstract
No abstract record available.
Inventors
- 👤 Miescher Karl
- 👤 Meystre Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:07
CPC Classifications
C; C07; C07J; C07J5/00; C07J1/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
PROCESS FOR THE REDUCTION OF COMPOUNDS OF THE CYCLOPENTANOPOLYHYDROPHENATHRENE SERIES, WHICH COMPRISES TREATING A MEMBER OF THE GROUP CONSISTING OF $4-3-KETO-BISNOR-CHLOENIC ACID AND $4-3-KETO-BISNOR-CHOLENIC ACID DERIVATIVES IN THE FORM OF A MEMBER OF THE GROUP CONSISTING OF 3ENOL-ETHERS AND 3-CYCLIC ACETALS WITH LITHIUMALUMINUM HYDRIDE AND HYDROLYZING THE SO FORMED REACTION PRODUCT, WHEREBY $4-3-KETO-22-HYDROXYBISNOR-CHOLENE IS OBTAINED.
Claim 2
Dependent Claim
55 words
PROCESS FOR THE REDUCTION OF COMPOUNDS OF THE CYCLOPENTANOPOLYHYDROPHENATHRENE SERIES, WHICH COMPRISES TREATING A MEMBER OF THE GROUP CONSISTING OF $4-3-KETO-BISNOR-CHLOENIC ACID AND $4-3-KETO-BISNOR-CHOLENIC ACID DERIVATIVES IN THE FORM OF A MEMBER OF THE GROUP CONSISTING OF 3ENOL-ETHERS AND 3-CYCLIC ACETALS WITH LITHIUMALUMINUM HYDRIDE AND HYDROLYZING THE SO FORMED REACTION PRODUCT, WHEREBY $4-3-KETO-22-HYDROXYBISNOR-CHOLENE IS OBTAINED.
References Cited (Backward Citations)
US2183489A
Cited
US2166877A
Cited
US2294433A
Cited
US2324522A
Cited
US2356154A
Cited
US2462133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-30 | 1956-06-30 | 1956-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-30 | 1960-06-30 | 1960-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-30 | 1964-06-30 | 1964-12-30 | $7700.00 | Window Closed / Lapsed |