US3287356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dihaloalkylation of keto steroids
Assignee: Merck and Co Inc
•
Filing: 1962-04-13
•
Granted: 1966-11-22
•
Expires: 1982-04-13
Abstract
No abstract record available.
Inventors
- 👤 Glen E Arth
- 👤 Alexander H Todd
- 👤 Thomas B Windholz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:13
CPC Classifications
C; C07; C07J; C07J21/00; C07J75/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
8 words
17 A,20,20,21 - BISMETHYLENEDIOXY - 2 - FORMYL-3-DIFLUOROMETHOXY-2,4-PREGNADIENE-11-ONE.
Claim 2
Dependent Claim
8 words
17 A,20,20,21 - BISMETHYLENEDIOXY - 2 - FORMYL-3-DIFLUOROMETHOXY-2,4-PREGNADIENE-11-ONE.
Claim 3
Dependent Claim
10 words
THE PROCESS WHICH COMPRISES REACTING A COMPOUND HAVING THE FORMULA:
Claim 4
Dependent Claim
10 words
THE PROCESS WHICH COMPRISES REACTING A COMPOUND HAVING THE FORMULA:
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) | 1969-11-21 | 1970-05-23 | 1970-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-21 | 1974-05-23 | 1974-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-21 | 1978-05-23 | 1978-11-22 | $7700.00 | Window Closed / Lapsed |