Patent US2648663A successfully refreshed from Google Patents.
US2648663A
Expired / Lapsed
US
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Preparation of 17alpha-hydroxy steroids
Assignee: Akzo Nobel Paints LLC
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Filing: 1949-08-04
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Granted: 1953-08-11
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Expires: 1969-08-04
Abstract
No abstract record available.
Inventors
- 👤 Percy L Julian
- 👤 Edwin W Meyer
- 👤 Ryden Isabelle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:01
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
THE PROCESS WHICH COMPRISES TREATING A C-20 CYCLIC LOWER ALKYLENE KETAL OF A 16,17-OXIDO20-KETO STEROID OF THE C21 SERIES, THE NUCELUS OF WHICH IS A CYCLOPENTANO-10,13-DIMETHYLPOLYHYDROPHENEANTHRENE RADICAL WITH LITHIUM ALUMINUM HYDRIDE.
Claim 2
Dependent Claim
31 words
THE PROCESS WHICH COMPRISES TREATING A C-20 CYCLIC LOWER ALKYLENE KETAL OF A 16,17-OXIDO20-KETO STEROID OF THE C21 SERIES, THE NUCELUS OF WHICH IS A CYCLOPENTANO-10,13-DIMETHYLPOLYHYDROPHENEANTHRENE RADICAL WITH LITHIUM ALUMINUM HYDRIDE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-10 | 1957-02-09 | 1957-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-10 | 1961-02-09 | 1961-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-10 | 1965-02-09 | 1965-08-11 | $7700.00 | Window Closed / Lapsed |