US2870174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclopentanophenanthrene derivatives and method for the production thereof
Assignee: Individual
•
Filing: 1955-06-02
•
Granted: 1959-01-20
•
Expires: 1975-06-02
Abstract
No abstract record available.
Inventors
- 👤 Djerassi Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:58
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
A METHOD FOR THE PREPARATION OF THE LOWER FATTY ACID ACYLATE OF 6-IODO>4.17(20)-PREGNADIENE-20-OL-3-ONE WHICH COMPRISES REACTING THE DI-LOWER FATTY ACID ACYLATE OF >3,5.17(20)-PREGNATRIENE-3,20-DIOL WITH N-IODOSUCCINIMIDE AT A TEMPERATURE BELOW 30*C.
Claim 2
Independent Claim
30 words
A METHOD FOR THE PREPARATION OF THE LOWER FATTY ACID ACYLATE OF 6-IODO>4.17(20)-PREGNADIENE-20-OL-3-ONE WHICH COMPRISES REACTING THE DI-LOWER FATTY ACID ACYLATE OF >3,5.17(20)-PREGNATRIENE-3,20-DIOL WITH N-IODOSUCCINIMIDE AT A TEMPERATURE BELOW 30*C.
References Cited (Backward Citations)
US2677695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |