Patent US2840581A successfully refreshed from Google Patents.
US2840581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbonyloxy steroids
Assignee: Pharmacia and Upjohn Co
•
Filing: 1956-12-17
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Granted: 1958-06-24
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Expires: 1976-12-17
Abstract
No abstract record available.
Inventors
- 👤 John A Hogg
- 👤 Korman Jerome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:43
CPC Classifications
C; C07; C07J; C07J13/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
19-NOR-1,3,5(10),17(20)-PREGNATETRAENE- 3,21 - DIOLS OF THE FORMULA
Claim 2
Dependent Claim
7 words
19-NOR-1,3,5(10),17(20)-PREGNATETRAENE- 3,21 - DIOLS OF THE FORMULA
References Cited (Backward Citations)
US2774775A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |