US3657220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfo-containing phenyl-azo-phenyl dyestuff compounds
Assignee: EIDP Inc
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Filing: 1969-12-31
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Granted: 1972-04-18
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Expires: 1989-12-31
Abstract
Abstract ORANGE OR RED MONOAZO ACID DYES, USEFUL FOR DYEING SYNTHETIC POLYAMIDE FIBERS UNDER NEUTRAL TO WEAKLY ACIDIC CONDITIONS, HAVING THE FORMULA 5-X-BENZENE 1-((A,B,(Z-O3S-)PHENYL)-N=N-),2-(R2-CO-HN-),4-((R1-)2-N-), WHEREIN A IS H, CL, METHYL, METHOXY, NHCOALKYL, NHCOPHENYL OR HNCOPHENYL CONTAINING ONE SUBSTITUENT SELECTED FROM METHYL, METHOXY AND CL; B IS H, CL OR METHYL; Z IS H OR A MONOVALENT ALKALI METAL, AMMONIUM OR SUBSTITUTED AMMONIUM CATION; X IS H OR ALKOXY; R1 IS ALKYL; AND R2 IS ALKYL, PHENYL OR PHENYL CONTAINING ONE SUBSTITUENT SELECTED FROM METHYL, METHOXY AND CL; SAID ALKYL AND ALKOXY GROUPS CONTAINING ONE TO FOUR CARBON ATOMS.
Inventors
- 👤 Lindsay Kilmurry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:57
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/02; D06P3/04; D06P3/24; D06P3/241; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/924; Y10S8/929
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |