US2590978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Introduction of a double bond adjacent a keto group in ketosteroids
Assignee: Research Corp
•
Filing: 1949-04-28
•
Granted: 1952-04-01
•
Expires: 1969-04-28
Abstract
No abstract record available.
Inventors
- 👤 Edward C Kendall
- 👤 Vernon R Mattox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:05
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
PROCESS FOR THE INTRODUCTION OF A DOUBLE BOND BETWEEN CARBON ATOMS VICINAL TO A KETO GROUP IN KETOSTEROIDS WHICH COMPRISES REACTING A KETOSTEROID HAVING AN ATOMS OF BROMINE ON THE CARBON ATOM ALPHA TO THE KETONE GROUP AND A HYDROGEN ON THE NEXT ADJACENT CARBON WITH A HYDRAZINE DERIVATIVE OF THE GROUP CONSISTING OF THE MONOCYCLICARYLHYDRAZINES AND SEMICARBAZIDE THEREBY ELIMINATING HYDROGEN BROMIDE FROM THE KEROSTEROID MOLECULE.
Claim 2
Dependent Claim
66 words
PROCESS FOR THE INTRODUCTION OF A DOUBLE BOND BETWEEN CARBON ATOMS VICINAL TO A KETO GROUP IN KETOSTEROIDS WHICH COMPRISES REACTING A KETOSTEROID HAVING AN ATOMS OF BROMINE ON THE CARBON ATOM ALPHA TO THE KETONE GROUP AND A HYDROGEN ON THE NEXT ADJACENT CARBON WITH A HYDRAZINE DERIVATIVE OF THE GROUP CONSISTING OF THE MONOCYCLICARYLHYDRAZINES AND SEMICARBAZIDE THEREBY ELIMINATING HYDROGEN BROMIDE FROM THE KEROSTEROID MOLECULE.
References Cited (Backward Citations)
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 |