US2640838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Delta9(11)-pregnenes and process
Assignee: Merck and Co Inc
•
Filing: 1952-05-22
•
Granted: 1953-06-02
•
Expires: 1972-05-22
Abstract
No abstract record available.
Inventors
- 👤 Norman L Wendler
- 👤 Robert P Graber
- 👤 Jr Alfred C Haven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:28
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
1 words
4-BROMO-$9(11)-PREGNENE-17(A),21-DIOL-3,20DIONE-21-ACYLATE.
Claim 2
Dependent Claim
1 words
4-BROMO-$9(11)-PREGNENE-17(A),21-DIOL-3,20DIONE-21-ACYLATE.
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) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |