Patent US4756564A successfully refreshed from Google Patents.
Patent US2888457A successfully refreshed from Google Patents.
US2888457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bismethylenedioxy steroids and methods of making same
Assignee: Merck and Co Inc
•
Filing: 1958-08-18
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Granted: 1959-05-26
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Expires: 1978-08-18
Abstract
No abstract record available.
Inventors
- 👤 Roger E Beyler
- 👤 Lewis H Sarett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:02
CPC Classifications
C; C07; C07J; C07J21/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
17-20,20-21 BISMETHYLENEDIOXY PREGANANES HAVING AT THE 3-POSITION A SUBSTITUENT SELECTED FROM THE CLASS CONSISTING OF KETO AND HYDROXY GROUPS AND GROUPS CONVERTIBLE THERETO BY HYDROLYSIS, AND HAVING AT THE 11-POSITION A SUBSTITUENT SELECTED FROM THE CLASS CONSISTING OF HYDROGEN, HYDROXY AND KETO GROUPS; AND UNSATURATED DERIVATIVES THEREOF.
Claim 2
Dependent Claim
47 words
17-20,20-21 BISMETHYLENEDIOXY PREGANANES HAVING AT THE 3-POSITION A SUBSTITUENT SELECTED FROM THE CLASS CONSISTING OF KETO AND HYDROXY GROUPS AND GROUPS CONVERTIBLE THERETO BY HYDROLYSIS, AND HAVING AT THE 11-POSITION A SUBSTITUENT SELECTED FROM THE CLASS CONSISTING OF HYDROGEN, HYDROXY AND KETO GROUPS; AND UNSATURATED DERIVATIVES 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) | 1962-05-25 | 1962-11-24 | 1963-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-25 | 1966-11-24 | 1967-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-25 | 1970-11-24 | 1971-05-26 | $7700.00 | Window Closed / Lapsed |