US2990401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
11-substituted 16alpha, 17alpha-substituted methylenedioxy steroids
Assignee: Wyeth Holdings LLC
•
Filing: 1958-06-18
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Granted: 1961-06-27
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Expires: 1978-06-18
Abstract
No abstract record available.
Inventors
- 👤 Bernstein Seymour
- 👤 Jr George R Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:54
CPC Classifications
C; C07; C07J; C07J71/00; C07J75/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
4 words
THE COMPOUND 9A-FLUORO-11B,21-DIHYDROXY-16A,17AISOPROPYLIDENEDIOXY-1,4,6-PREGNATRIENE -3,20-DIONE.
Claim 2
Dependent Claim
4 words
THE COMPOUND 9A-FLUORO-11B,21-DIHYDROXY-16A,17AISOPROPYLIDENEDIOXY-1,4,6-PREGNATRIENE -3,20-DIONE.
Claim 3
Dependent Claim
10 words
THE COMPOUND 11A - HYDROXY - 16A, 17A - ISOPROPYLIDENEDIOXY-4-PREGNENE-3,20-DIONE.
Claim 4
Dependent Claim
10 words
THE COMPOUND 11A - HYDROXY - 16A, 17A - ISOPROPYLIDENEDIOXY-4-PREGNENE-3,20-DIONE.
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) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |