Patent US2665274A successfully refreshed from Google Patents.
US2665274A
Expired / Lapsed
US
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Steroid pyridinium salts
Assignee: Merck and Co Inc
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Filing: 1952-04-30
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Granted: 1954-01-05
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Expires: 1972-04-30
Abstract
No abstract record available.
Inventors
- 👤 John P Conbere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:22
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06; C07D213/16; C07D213/20; C07J; C07J43/00; C07J43/003; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
$4-17A-HYDROXY-3,11,20-TRIKETOPREGNENYL-21PYRIDINIUM P-TOLUENESULFONATE HAVING THE FORMULA
Claim 2
Dependent Claim
5 words
$4-17A-HYDROXY-3,11,20-TRIKETOPREGNENYL-21PYRIDINIUM P-TOLUENESULFONATE 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) | 1957-01-04 | 1957-07-06 | 1958-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-04 | 1961-07-06 | 1962-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-04 | 1965-07-06 | 1966-01-05 | $7700.00 | Window Closed / Lapsed |