Patent US3741987A successfully refreshed from Google Patents.
US3741987A
Expired / Lapsed
US
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Intermediates in total synthesis of 16-dehydroprogesterone
Assignee: Leland Stanford Junior University
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Filing: 1970-09-09
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Granted: 1973-06-26
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Expires: 1990-09-09
Abstract
Abstract dl-Pregna-4,16-diene-3,20-dione (16-dehydroprogesterone) and dl17-formylandrosta-4,16-diene-3,20-dione are prepared by a series of reactions starting with 1-methylcyclopropyl methyl ketone.
Inventors
- 👤 W Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:23
CPC Classifications
C; C07; C07D; C07D317/00; C07D317/08; C07D317/10; C07D317/14; C07D317/30; C07C; C07C17/00; C07C17/093; C07D317/26
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
12 words
The compound according to claim 1 wherein R is methyl, Y'' is
Claim 2
Dependent Claim
12 words
The compound according to claim 1 wherein R is methyl, Y'' is
Claim 3
Dependent Claim
24 words
The compound according to claim 1 wherein R is methyl, Y'' and Y* are C O, A is CH CH and Z is hydrogen.
Claim 4
Dependent Claim
14 words
The compound according to claim 1 wherein R is methyl, Y'' and Y* are
Claim 5
Dependent Claim
14 words
The compound according to claim 1 wherein R is methyl, Y'' and Y* are
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |