US2728783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing delta9-3,20-diketo-17alpha-hydroxy-21-acetoxy-pregnene
Assignee: Merck and Co Inc
•
Filing: 1953-04-02
•
Granted: 1955-12-27
•
Expires: 1973-04-02
Abstract
No abstract record available.
Inventors
- 👤 Robert P Graber
- 👤 Norman L Wendler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:39
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
THE PROCESS WHICH COMPRISES REACTING 3,20-DIKETO11B-17A-DIHYDROXY-21-ACETOXY-PREGNANE WITH A DEHYDRATEING AGENT THEREBY FORMING $9(11)-3,20-KIDETO-17A-HYDROXY21-ACTEOXY-PREGNENE.
Claim 2
Dependent Claim
13 words
THE PROCESS WHICH COMPRISES REACTING 3,20-DIKETO11B-17A-DIHYDROXY-21-ACETOXY-PREGNANE WITH A DEHYDRATEING AGENT THEREBY FORMING $9(11)-3,20-KIDETO-17A-HYDROXY21-ACTEOXY-PREGNENE.
References Cited (Backward Citations)
US2409798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |