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US3255218A
Expired / Lapsed
US
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17(20)-enol-21-aldehydes of the pregnane series
Assignee: Merck Sharp & Dohme LLC
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Filing: 1962-03-28
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Granted: 1966-06-07
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Expires: 1982-03-28
Abstract
No abstract record available.
Inventors
- 👤 Hershel L Herzog
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:25
CPC Classifications
C; C07; C07J; C07J13/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
13 words
COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF PREGNANES HAVING THE FOLLOWING STRUCTURAL FORMULAE:
References Cited (Backward Citations)
US2837464A
Cited
US2795594A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-06 | 1969-12-06 | 1970-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-06 | 1973-12-06 | 1974-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-06 | 1977-12-06 | 1978-06-07 | $7700.00 | Window Closed / Lapsed |