US2590637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct halogenation of steroids with an unsaturated side chain in 17-position and the dehydrohalogenation of resultant products
Assignee: CIBA PHARM PROD Inc
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Filing: 1950-08-17
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Granted: 1952-03-25
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Expires: 1970-08-17
Abstract
No abstract record available.
Inventors
- 👤 Miescher Karl
- 👤 Ehmann Ludwig
- 👤 Wettstein Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:11
CPC Classifications
C; C07; C07J; C07J9/00; C07J75/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
49 words
PROCESS FOR THE DIRECT HALOGEN-SUBSTITUTION OF STEROIDS AND THEIR DEHALOGENATION PRODUCTS, WHICH COMPRISES TREATING A $23 - 24,24 - DIARYLCHOLENE WITH BROMINE, WHILE EXPOSING THE REACTANTS TO THE ACTION OF STRONG LIGHT AND TREATING THE SO-FORMED $23 - 22 - BROMO - 24,24 - DIARYLCHOLENE WITH A DEHYDROHALOGENATING AGENT.
References Cited (Backward Citations)
GB544051A
Cited
US2461912A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-25 | 1955-09-24 | 1956-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-25 | 1959-09-24 | 1960-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-25 | 1963-09-24 | 1964-03-25 | $7700.00 | Window Closed / Lapsed |