Patent US2720523A successfully refreshed from Google Patents.
US2720523A
Expired / Lapsed
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Pregnadiene compounds
Assignee: CIBA PHARM PROD Inc
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Filing: 1953-12-07
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Granted: 1955-10-11
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Expires: 1973-12-07
Abstract
No abstract record available.
Inventors
- 👤 Harold B Macphillamy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:24
CPC Classifications
C; C07; C07J; C07J43/00; C07J43/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF 3-KETO-21-(1-PIPERIDYL)-4,17-PREGNADIENE AND THE MONOHYDROHALIDES THEREOF.
Claim 2
Dependent Claim
13 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF 3-KETO-21-(1-PIPERIDYL)-4,17-PREGNADIENE AND THE MONOHYDROHALIDES THEREOF.
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) | 1958-10-10 | 1959-04-11 | 1959-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-10 | 1963-04-11 | 1963-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-10 | 1967-04-11 | 1967-10-11 | $7700.00 | Window Closed / Lapsed |