US2676971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quaternary ammonium derivatives of aminoalkylxanthenes and aminoalkylthiaxanthenes
Assignee: GD Searle LLC
•
Filing: 1951-04-21
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Granted: 1954-04-27
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Expires: 1971-04-21
Abstract
No abstract record available.
Inventors
- 👤 John W Cusic
- 👤 Richard A Robinson
- 👤 Clinton A Dornfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:04
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/78; C07D311/80; C07D311/82; C07D311/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
THE QUATERNARY SALTS OF THE STRUCTURAL FORMULA FORMULA
Claim 2
Dependent Claim
8 words
THE QUATERNARY SALTS OF THE STRUCTURAL FORMULA FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-26 | 1957-10-26 | 1958-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-26 | 1961-10-26 | 1962-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-26 | 1965-10-26 | 1966-04-27 | $7700.00 | Window Closed / Lapsed |