Patent US4663440A successfully refreshed from Google Patents.
US4663440A
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Bisazo brown reactive dye
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1981-05-26
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Granted: 1987-05-05
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Expires: 2001-05-26
Abstract
Abstract A brown reactive dye represented by a free acid of the formula, ##STR1## wherein R is a hydrogen atom or a C 1 to C 4 alkyl group, X is --SO 2 CH 2 CH 2 Cl, --SO 2 CH═CH 2 , --SO 2 CH 2 CH 2 OSO 3 H or --SO 2 CH 2 CH 2 OPO 3 H 2 , rings A, B and C are each a benzene or naphthalene ring which may have other substituent, m is 0 to 3 and n is 0 to 1. This dye is suitable for dyeing cellulose fibers brown to afford dyeings superior in fastnesses, acid stability, build-up property and level dyeing property.
Inventors
- 👤 Takashi Omura
- 👤 Masaki Sunami
- 👤 Yasuo Tezuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:24
CPC Classifications
C; C09; C09B; C09B62/00; C09B62/44; C09B62/503; C09B62/507; C09B62/513; C09B62/4401; C09B62/4403; C09B62/4411; C09B62/4415; C09B43/00; C09B43/12; C09B43/136; C09B43/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
11 words
A compound represented by a free acid of the formula, ##STR15##
Claim 2
Dependent Claim
11 words
A compound represented by a free acid of the formula, ##STR15##
Claim 3
Dependent Claim
11 words
A compound represented by a free acid of the formula, ##STR16##
Claim 4
Dependent Claim
11 words
A compound represented by a free acid of the formula, ##STR16##
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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) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |