US2590993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Introduction of a double bond in ketosteroids
Assignee: Research Corp
•
Filing: 1951-03-30
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Granted: 1952-04-01
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Expires: 1971-03-30
Abstract
No abstract record available.
Inventors
- 👤 Warren F Mcguckin
- 👤 Edward C Kendall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:30
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
PROCESS FOR THE INTRODUCTION OF A 4,5 DOUBLE BOND INTO 3-KETO-4-BROMOSTEROIDS WHICH COMPRISES REACTING A 3-KETO-4-BROMOSTEROID WITH SEMICARBAZIDE AND TREATING THE SEMICARBAZONE THEREBY FORMED WITH AN ALDEHYDE OF THE GROUP CONSISTING OF BENZALDEHYDE, HYDROXYBENZALDEHYDES AND CARBOXYBENZALDEHYDES TO FROM THE CORRESPONSING 3-KETO-$4-STEROID.
Claim 2
Dependent Claim
41 words
PROCESS FOR THE INTRODUCTION OF A 4,5 DOUBLE BOND INTO 3-KETO-4-BROMOSTEROIDS WHICH COMPRISES REACTING A 3-KETO-4-BROMOSTEROID WITH SEMICARBAZIDE AND TREATING THE SEMICARBAZONE THEREBY FORMED WITH AN ALDEHYDE OF THE GROUP CONSISTING OF BENZALDEHYDE, HYDROXYBENZALDEHYDES AND CARBOXYBENZALDEHYDES TO FROM THE CORRESPONSING 3-KETO-$4-STEROID.
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) | 1955-04-01 | 1955-10-01 | 1956-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-01 | 1959-10-01 | 1960-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-01 | 1963-10-01 | 1964-04-01 | $7700.00 | Window Closed / Lapsed |