Patent US2884424A successfully refreshed from Google Patents.
US2884424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of triazoles and amidrazones of the anthraquinone series
Assignee: Wyeth Holdings LLC
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Filing: 1957-11-18
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Granted: 1959-04-28
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Expires: 1977-11-18
Abstract
No abstract record available.
Inventors
- 👤 Klingsberg Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:42
CPC Classifications
C; C07; C07D; C07D249/00; C07D249/02; C07D249/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
THE PROCESS OF PREPARING A CONDENSATION PRODUCT OF THE ANTHRAQUINONE SERIES WHICH COMPRISES HEATING AN ARYL CARBOHYDRAZIDE WITH AN AROYLARYLIDE CHLORIMIDE ABOVE 120* C. IN AN INERT AROMATIC SOLVENT, AT LEAST ONE OF SAID CARBOHYDRAZIDE AND SAID CHLORIMIDE BEING AN ANTHRAQUINONYL DERIVATIVE.
Claim 2
Dependent Claim
42 words
THE PROCESS OF PREPARING A CONDENSATION PRODUCT OF THE ANTHRAQUINONE SERIES WHICH COMPRISES HEATING AN ARYL CARBOHYDRAZIDE WITH AN AROYLARYLIDE CHLORIMIDE ABOVE 120* C. IN AN INERT AROMATIC SOLVENT, AT LEAST ONE OF SAID CARBOHYDRAZIDE AND SAID CHLORIMIDE BEING AN ANTHRAQUINONYL DERIVATIVE.
References Cited (Backward Citations)
US2352944A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-27 | 1962-10-27 | 1963-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-27 | 1966-10-27 | 1967-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-27 | 1970-10-27 | 1971-04-28 | $7700.00 | Window Closed / Lapsed |