Patent CH50374A successfully refreshed from Google Patents.
Patent US2773077A successfully refreshed from Google Patents.
US2773077A
Expired / Lapsed
US
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Preparation of steroid 21-aldehydes
Assignee: Merck and Co Inc
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Filing: 1953-06-16
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Granted: 1956-12-04
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Expires: 1973-06-16
Abstract
No abstract record available.
Inventors
- 👤 John P Conbere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:07
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
50 words
A PROCESS WHICH COMPRISES REACTING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF 20 - KETO - 21HYDROXYPREGNENES, 20 - KETO - 21 - HYDROXY - ALLOPREGNANES AND 20 - KETO - 21 - HYDROXYPREGNANES WITH CUPRIC ACETATE TO PRODUCE THE CORRESPONDING 20 - KETO - 21 - ALDEHYDE COMPOUND.
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) | 1959-12-04 | 1960-06-04 | 1960-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-04 | 1964-06-04 | 1964-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-04 | 1968-06-04 | 1968-12-04 | $7700.00 | Window Closed / Lapsed |