Patent US3663528A successfully refreshed from Google Patents.
US3663528A
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Azo pyrazole dyestuffs containing an amino-,hydrazino- or etherified hydroxyl-aminoalkylene group which may be quaternized
Assignee: BASF Schweiz AG
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Filing: 1969-04-29
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Granted: 1972-05-16
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Expires: 1989-04-29
Abstract
Abstract BASIC AZO DYESTUFF OF THE FORMULA 1-(Z-Y-),5-A,4-(D1-N=N-),3-B-PYRAZOLE WHEREIN Y DENOTES AN ALKYLENE CHAIN OF UP TO 6 CARBON ATOMS WHICH MAY BE INTERRUPTED BY A HETERO-ATOM SELECTED FROM THE GROUP CONSISTING OF NITROGEN, OXYGEN OR SULFUR, A DENOTES AMINO OR LOWER ALKYLAMINO, B DENOTES HYDROGEN, LOWER ALKYL, LOWER ALKOXY OR PHENYL, Z DENOTES AN AMINO, HYDRAZINO OR ETHERIFIED HYDROZYLAMINO GROUP WHICH MAY BE QUATERNIZED, AND D1 IS THE RESIDUE OF A DIAZO COMPONENT; THE NEW DYESTUFFS ARE ESPECIALLY VALUABLE FOR DYEING SYNTHETIC FIBERS SUCH AS POLYVINYLCHLORIDE, POLYAMIDE OR POLYURETHANE WITH GOOD GENERAL FASTNESS PROPERTIES, SUCH AS FASTNESS TO LIGHT, WASHING AND SUBLIMATION.
Inventors
- 👤 Visvanathan Ramanathan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:20
CPC Classifications
C; C09; C09B; C09B44/00; C09B44/02; C09B44/08; C09B31/00; C09B31/02; C09B31/12; C09B31/14; C09B31/143; C09B31/147
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |