Patent US4442287A successfully refreshed from Google Patents.
US4442287A
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Anthraquinone dyes
Assignee: BASF SE
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Filing: 1982-06-30
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Granted: 1984-04-10
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Expires: 2002-06-30
Abstract
Abstract Dyes of the formula <IMAGE> where Hal is chlorine or bromine, X is hydrogen, hydroxyphenyl or alkoxyphenyl, n is 1 or 2, or, when X is hydroxyphenyl or alkoxyphenyl, may furthermore be O, R1, R2, R3 and R4 independently of one another are each unsubstituted or alkoxy-substituted alkyl, and R1 and R3 may furthermore be hydrogen, are of high color strength, and very useful for dyeing and printing cellulose-containing fiber material or cellulose swollen by means of water-miscible swelling agents.
Inventors
- 👤 Ernst Hartwig
- 👤 Reinhold Krallmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:46
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/50; C09B1/51; C09B1/516; D; D06; D06P; D06P3/00; D06P3/58; D06P3/60; D06P3/6033; D06P3/6041
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
26 words
A dye of the formula ##STR14## where X is hydrogen, 4-hydroxyphenyl or 4-methoxyphenyl, and ##STR15## are each independently --N(CH 3 ) 2 or --NHCH 3 .
Claim 2
Dependent Claim
26 words
A dye of the formula ##STR14## where X is hydrogen, 4-hydroxyphenyl or 4-methoxyphenyl, and ##STR15## are each independently --N(CH 3 ) 2 or --NHCH 3 .
Claim 3
Dependent Claim
20 words
The dye as claimed in claim 1, wherein X is hydrogen and ##STR16## are each --N(CH 3 ) 2 .
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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) | 1987-04-10 | 1987-10-10 | 1988-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-10 | 1991-10-10 | 1992-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-10 | 1995-10-10 | 1996-04-10 | $7700.00 | Window Closed / Lapsed |