Patent US2659732A successfully refreshed from Google Patents.
US2659732A
Expired / Lapsed
US
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Quaternary ammonium salts of dialkyl aminoalkyl xanthene-9-carboxylates and the production thereof
Assignee: GD Searle LLC
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Filing: 1952-05-10
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Granted: 1953-11-17
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Expires: 1972-05-10
Abstract
No abstract record available.
Inventors
- 👤 John W Cusie
- 👤 Richard A Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:02
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/78; C07D311/80; C07D311/82; C07D311/84
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
A QUATERNARY AMMONIUM SALT OF AN AMINOALKLY ESTER OF XANTHENE-9-CARBOXYLIC ACID, SAID SALT HAVING THE FORMULA
Claim 2
Dependent Claim
16 words
A QUATERNARY AMMONIUM SALT OF AN AMINOALKLY ESTER OF XANTHENE-9-CARBOXYLIC ACID, SAID SALT HAVING THE FORMULA
References Cited (Backward Citations)
US2423025A
Cited
US2334310A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-16 | 1957-05-18 | 1957-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-16 | 1961-05-18 | 1961-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-16 | 1965-05-18 | 1965-11-17 | $7700.00 | Window Closed / Lapsed |