US3579498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making azo,3-substituted pyrazolone dyes
Assignee: EIDP Inc
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Filing: 1967-11-06
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Granted: 1971-05-18
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Expires: 1987-11-06
Abstract
Abstract ARYLAZO-, ARYL DISAZO-, AND BENZOTHIAZOLYLARYLAZO-1,3SUBSTITUTED-5-PYRAZOLONES, FOR EXAMPLE, 1-(CH3-)2-N-CH2-),3-CH3,4-((4-CH3-PHENYL)-N=N-), 5-OH-PYRAZOLE 2-((1-(HO-CH2-),3-CH3,5-OH-PYRAZOL-4-YL)-N=N- (1,4-PHENYLENE)-),6-CH3,7-(NA-O3S-)BENZOTHIAZOLE USEFUL AS PAPER DYES HAVING GOOD WATER SOLUBILITY, BLEACHABILITY, BRIGHTNESS, LIGHTFASTNESS AND TINCTORIAL STRENGTH, AND AS INTERMEDIATES FOR CATIONIC DYES WHICH IN TURN ARE USEFUL IN DYEING ACID MODIFIED ACRYLIC, POLYESTER AND POLYAMIDE FIBERS.
Inventors
- 👤 William Paul Dunworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:44
CPC Classifications
C; C09; C09B; C09B31/00; C09B31/02; C09B31/12; C09B31/14; C09B31/143; C09B31/147; Y; Y10; Y10S; Y10S8/00; Y10S8/916; Y10S8/919; Y10S8/93; Y10S8/931
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |