Patent US6416536B1 successfully refreshed from Google Patents.
US2776299A
Expired / Lapsed
US
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Quaternary ammonium salts of dialkylaminoalkyl esters of thiaxanthene-10-carboxylic acid
Assignee: GD Searle LLC
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Filing: 1954-07-02
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Granted: 1957-01-01
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Expires: 1974-07-02
Abstract
No abstract record available.
Inventors
- 👤 John W Cusic
- 👤 Richard A Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:50
CPC Classifications
C; C07; C07D; C07D335/00; C07D335/04; C07D335/10; C07D335/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
A QUARTERNARY AMMONIUM SALT OF A DIALKYLAMINOALKYL ESTER OF THIAXANTHENE-10-CARBOXYLIC ACID, HAVING THE FORMULA
Claim 2
Dependent Claim
14 words
A QUARTERNARY AMMONIUM SALT OF A DIALKYLAMINOALKYL ESTER OF THIAXANTHENE-10-CARBOXYLIC ACID, HAVING THE FORMULA
References Cited (Backward Citations)
US2659732A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-01 | 1960-07-02 | 1961-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-01 | 1964-07-02 | 1965-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-01 | 1968-07-02 | 1969-01-01 | $7700.00 | Window Closed / Lapsed |