US3357974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processes for preparing 16alpha, 17alpha-acetals and ketals of 16alpha, 17alpha, 21-trihydroxy-delta4-pregnene-3, 20-diones
Assignee: Merck and Co Inc
•
Filing: 1965-12-28
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Granted: 1967-12-12
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Expires: 1985-12-28
Abstract
No abstract record available.
Inventors
- 👤 Taub David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:03
CPC Classifications
C; C07; C07J; C07J71/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
11 words
A PROCESS FOR THE PREPARATION OF A COMPOUND OF THE FORMULA:
Claim 2
Dependent Claim
11 words
A PROCESS FOR THE PREPARATION OF A COMPOUND OF THE FORMULA:
References Cited (Backward Citations)
US3042670A
Cited
US3116304A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-12-11 | 1971-06-12 | 1971-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-11 | 1975-06-12 | 1975-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-11 | 1979-06-12 | 1979-12-12 | $7700.00 | Window Closed / Lapsed |