US2617812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing delta9,11-12-keto steroids from delta8,9-12-keto steroids
Assignee: Merck and Co Inc
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Filing: 1950-11-29
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Granted: 1952-11-11
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Expires: 1970-11-29
Abstract
No abstract record available.
Inventors
- 👤 Evelyn H Wilson
- 👤 Tishler Max
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:39
CPC Classifications
C; C07; C07J; C07J9/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
THE PROCESS FOR PREPARING A $9.11-12-KETO COMPOUND OF THE CYCLOPENTANOPOLYHYDROPHENANTHRENE SERIES WHICH COMPRISES REACTING A $8,912 - KETO CYCLOPENTANOPOLYHYDROPHENANTHRENE COMPOUND WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF MINERAL ACIDS AND STRONG ALKALIS.
Claim 2
Dependent Claim
34 words
THE PROCESS FOR PREPARING A $9.11-12-KETO COMPOUND OF THE CYCLOPENTANOPOLYHYDROPHENANTHRENE SERIES WHICH COMPRISES REACTING A $8,912 - KETO CYCLOPENTANOPOLYHYDROPHENANTHRENE COMPOUND WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF MINERAL ACIDS AND STRONG ALKALIS.
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) | 1955-11-11 | 1956-05-12 | 1956-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-11 | 1960-05-12 | 1960-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-11 | 1964-05-12 | 1964-11-11 | $7700.00 | Window Closed / Lapsed |