US3658781A
Expired / Lapsed
US
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Basic monoazo dyestuffs containing a heterocyclic diazo component
Assignee: BASF Schweiz AG
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Filing: 1969-12-09
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Granted: 1972-04-25
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Expires: 1989-12-09
Abstract
Abstract BASIC AZO DYESTUFFS CONTAINING A HETEROCYCLIC DIAZO COMPONENT AND AS RADICAL OF THE COUPLING COMPONENT A PARAALKYLAMINOBENZENE CONTAINING A HETEROCYCLIC TERTIARY OR QUATERNARY AMINE BOUND TO THE ALKYL RADICAL VIA ITS NITROGEN ATOM.
Inventors
- 👤 Gert Hegar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:26
CPC Classifications
C; C09; C09B; C09B44/00; C09B44/02; C09B44/08; C09B29/00; C09B29/0025; C09B29/0074; C09B44/04; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/927
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |