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US2708202A
Expired / Lapsed
US
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Pregnene-21-aldehydes, their derivatives and process thereof
Assignee: Merck and Co Inc
•
Filing: 1952-04-30
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Granted: 1955-05-10
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Expires: 1972-04-30
Abstract
No abstract record available.
Inventors
- 👤 Iii Karl Pfister
- 👤 William J Leanza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:56
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
1 words
$4-3,11,20-TRIKETO-17A-HYDROXYPREGNENE-21ALDEHYDE.
Claim 2
Dependent Claim
1 words
$4-3,11,20-TRIKETO-17A-HYDROXYPREGNENE-21ALDEHYDE.
References Cited (Backward Citations)
US2563247A
Cited
US2577018A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-09 | 1958-11-08 | 1959-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-09 | 1962-11-08 | 1963-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-09 | 1966-11-08 | 1967-05-10 | $7700.00 | Window Closed / Lapsed |