US2949453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
3, 20-diketo-11-oxygenated-17, 21-dihydroxy-allopregnane 3-cyclic alkylene ketal 21-organic sulfonate compounds
Assignee: Merck and Co Inc
•
Filing: 1957-04-15
•
Granted: 1960-08-16
•
Expires: 1977-04-15
Abstract
No abstract record available.
Inventors
- 👤 Lewis H Sarett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:28
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
10 words
3,11,20-TRIKETO - 17A,21 - DIHYDROXYALLOPREGNANE 3ETHYLENE CYCLIC KETAL 21-METHANE SULFONATE.
Claim 2
Dependent Claim
10 words
3,11,20-TRIKETO - 17A,21 - DIHYDROXYALLOPREGNANE 3ETHYLENE CYCLIC KETAL 21-METHANE SULFONATE.
References Cited (Backward Citations)
US2763671A
Cited
US2842568A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-16 | 1964-02-15 | 1964-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-16 | 1968-02-15 | 1968-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-16 | 1972-02-15 | 1972-08-16 | $7700.00 | Window Closed / Lapsed |