US3580901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Maroon disazo dyes for polyamide fibers
Assignee: Crompton and Knowles Corp
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Filing: 1968-11-14
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Granted: 1971-05-25
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Expires: 1988-11-14
Abstract
Abstract COMPOUNDS THAT ARE USEFUL AS NEUTRAL DYEING DYES FOR POLYAMIDE FIBERS AND DYE SUCH FIBERS IN LEVEL, LIGHTFAST MAROON SHADES. THE DYES HAVE THE STRUCTURE: ((R1-PHENYL)-N=N-(NAPHTH-1,4-YLENE)-N=N-(R2-1,4-PHENYLENE)- N(-R3)-CH2-),(M-O3S-)-BENZENE WHEREIN R1 REPRESENTS -H, -CH3, -OCH3 OR -CL; R2 REPRESENTS -H OR -CH3; R3 REPRESENTS LOWER ALKYL HAVING 1 TO 4 C ATOMS AND M REPRESENTS -H, -NA, -K OR -NH4.
Inventors
- 👤 James F Feeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:01
CPC Classifications
C; C09; C09B; C09B31/00; C09B31/02; C09B31/04; C09B31/043; C09B31/047; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/924; Y10S8/929
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |