US3629248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of oxazine dyestuffs
Assignee: Hoechst AG
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Filing: 1969-07-24
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Granted: 1971-12-21
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Expires: 1989-07-24
Abstract
Abstract A PROCESS FOR THE MANUFACTURE OF CRYSTALLINE, PURE AND BRILLIANT BASIC OXAZINE DYESTUFFS OF THE GENERAL FORMULA 2-R2,3-(R3-NH-),7-(R''-N(-R")-)PHENOXAZINIUM X(-) IN WHICH R'' AND R" REPRESENT LOWER ALKYL GROUPS, R2 REPRESENTS A HYDROGEN ATOM OR A METHYL GROUP, R3 STANDS FOR A HYDROGEN ATOM OR A LOWER ALKYL GROUP OR THE PHENYL GROUP WHICH MAY BE SUBSTITUTED BY METHYL, METHOXY OR ETHOXY GROUPS, AND X(-) REPRESENTS THE ANION ZNC13- OR ZNBRC12-, SAID DYESTUFFS YIELDING ON TANNED COTTON AND ON POLYACRYLONITRILE FIBRES BRILLIANT BLUE DYEINGS, SHOWING GOOD TO VERY GOOD FASTNESS TO LIGHT AND AN EXCELLENT FASTNESS TO WET PROCESSING ON POLYARYLONITRILE FIBRES.
Inventors
- 👤 Gustav Schafer
- 👤 Adam Trombetta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:20
CPC Classifications
C; C09; C09B; C09B19/00
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |