Patent US3189528A successfully refreshed from Google Patents.
US3189528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resolution of racemic delta4-3-keto-13beta-alkyl steroids by using corynebacterium siplex
Assignee: Wyeth LLC
•
Filing: 1963-07-25
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Granted: 1965-06-15
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Expires: 1983-07-25
Abstract
No abstract record available.
Inventors
- 👤 Leland L Smith
- 👤 Greenspan George
- 👤 Theodore J Foell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:10
CPC Classifications
C; C12; C12P; C12P33/00; C12P33/02; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/843
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
THE METHOD OF PREPARING COMPOUNDS OF THE STRUCTURE:
Claim 2
Independent Claim
8 words
THE METHOD OF PREPARING COMPOUNDS OF THE STRUCTURE:
References Cited (Backward Citations)
US2874172A
Cited
US2844513A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-14 | 1968-12-14 | 1969-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-14 | 1972-12-14 | 1973-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-14 | 1976-12-14 | 1977-06-15 | $7700.00 | Window Closed / Lapsed |