Patent US2739974A successfully refreshed from Google Patents.
US2739974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing delta4,6-3-ketosteroids
Assignee: GD Searle LLC
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Filing: 1953-04-06
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Granted: 1956-03-27
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Expires: 1973-04-06
Abstract
No abstract record available.
Inventors
- 👤 Frank B Colton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:42
CPC Classifications
C; C07; C07J; C07J5/00; C07J1/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
10 words
THE PROCESS OF PREPARING A $4,6-3-KETOSTEROID OF THE STRUCTURAL FORMULA
Claim 2
Dependent Claim
10 words
THE PROCESS OF PREPARING A $4,6-3-KETOSTEROID OF THE STRUCTURAL FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |