US2666068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Halogenation of steroids
Assignee: Pharmacia and Upjohn Co
•
Filing: 1951-10-15
•
Granted: 1954-01-12
•
Expires: 1971-10-15
Abstract
No abstract record available.
Inventors
- 👤 Arthur R Hanze
- 👤 Robert H Levin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:59
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
A PROCESS FOR THE HALOGENATION OF A 21ACYLOXY-17-A-HYDROXYPREGNANE-3,11,20-TRIONE TO PRODUCE A 4-HALO-21-ACYLOXY-17A-HYDROXYPREGNANE-3,11,20-TRIONE BY REACTION THEREWITH OF A HALOGENATING AGENT WHICH CONSISTS IN MIXING SUCH HALOGENATING AGENT AND A 21-ACYLOXY-17A-HYDROXYPREGNANE-3,11,20-TRIONE IN TERTIARY BUTYL ALCOHOL CONTAINING UP TO ABOUT EIGHTEEN PER CENT WATER BY VOLUME.
Claim 2
Dependent Claim
43 words
A PROCESS FOR THE HALOGENATION OF A 21ACYLOXY-17-A-HYDROXYPREGNANE-3,11,20-TRIONE TO PRODUCE A 4-HALO-21-ACYLOXY-17A-HYDROXYPREGNANE-3,11,20-TRIONE BY REACTION THEREWITH OF A HALOGENATING AGENT WHICH CONSISTS IN MIXING SUCH HALOGENATING AGENT AND A 21-ACYLOXY-17A-HYDROXYPREGNANE-3,11,20-TRIONE IN TERTIARY BUTYL ALCOHOL CONTAINING UP TO ABOUT EIGHTEEN PER CENT WATER BY VOLUME.
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) | 1957-01-11 | 1957-07-13 | 1958-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-11 | 1961-07-13 | 1962-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-11 | 1965-07-13 | 1966-01-12 | $7700.00 | Window Closed / Lapsed |