Patent US2864839A successfully refreshed from Google Patents.
US2864839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
delta4, 7, 9(11)-pregnatriene-17alpha, 21-diol-3, 20-dione and process therefor
Assignee: Olin Corp
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Filing: 1958-07-25
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Granted: 1958-12-16
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Expires: 1978-07-25
Abstract
No abstract record available.
Inventors
- 👤 Fried Josef
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:13
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
A STEROID OF THE GENERAL FORMULA
Claim 2
Dependent Claim
6 words
A STEROID OF THE GENERAL FORMULA
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) | 1961-12-15 | 1962-06-16 | 1962-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-15 | 1966-06-16 | 1966-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-15 | 1970-06-16 | 1970-12-16 | $7700.00 | Window Closed / Lapsed |