US2776927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of delta 1, 4-3-keto steroids from delta4 3-keto steroids by protaminobacter
Assignee: Pfizer Inc
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Filing: 1955-12-27
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Granted: 1957-01-08
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Expires: 1975-12-27
Abstract
No abstract record available.
Inventors
- 👤 Gilbert M Shull
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:17
CPC Classifications
C; C12; C12P; C12P33/00; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
A PROCESS FOR THE PREPARATION OF A 3-KETO-$1,4-STEROID COMPOUND WHICH PROCESS COMPRISE CONTACTING A 3-KETO$4-STEROID COMPOUND HAVING FROM 18 TO 21 ATOMS IN THE CARBON SKELETON WITH THE OXIDIZING ACTIVITY OF AN ORGANISM OF THE GENUS PROTAMINOBACTER.
Claim 2
Dependent Claim
37 words
A PROCESS FOR THE PREPARATION OF A 3-KETO-$1,4-STEROID COMPOUND WHICH PROCESS COMPRISE CONTACTING A 3-KETO$4-STEROID COMPOUND HAVING FROM 18 TO 21 ATOMS IN THE CARBON SKELETON WITH THE OXIDIZING ACTIVITY OF AN ORGANISM OF THE GENUS PROTAMINOBACTER.
References Cited (Backward Citations)
US2756179A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-08 | 1960-07-09 | 1961-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-08 | 1964-07-09 | 1965-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-08 | 1968-07-09 | 1969-01-08 | $7700.00 | Window Closed / Lapsed |