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Patent US3657187A successfully refreshed from Google Patents.
US3657187A
Expired / Lapsed
US
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Thiadiazolylazo compounds
Assignee: Novartis Corp
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Filing: 1969-06-16
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Granted: 1972-04-18
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Expires: 1989-06-16
Abstract
Abstract MONOAZO COMPOUNDS HAVING AN ALKYLTHIO-, ALKOXYCYCLOALKYLITHIO-, CYCLOALKOXY-, ARYLTHIO-, OR ARYLOXY-1,3,4THIADIAZOLYL DIAZO COMPONENT AND A M-TOLUIDINE COUPLING COMPONENT AND NITROGEN ATOM OF WHICH IS SUBSTITUTED BY THE GROUP -(CH2)N-X WHEEIN N IS 2 OR 3 AND X IS HYDROGEN, PYRROLIDINONO, ACYLAMIDO, CARBAMOYL, OR ALKANOYLOXY. THE AZO COMPOUNDS ARE USEFUL FOR DYEING POLYAMIDE MATERIALS BRIGHT, FAST RED TO PINK SHADES AND EXHIBIT EXCELLENT FASTNESS TO LIGHT AND IMPROVED BUILD-UP AND MIGRATION.
Inventors
- 👤 Max A Weaver
- 👤 David J Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:03
CPC Classifications
C; C09; C09B; C09B29/00; C09B29/0025; D; D06; D06P; D06P3/00; D06P3/02; D06P3/04; D06P3/24; D06P3/26
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 |