Process for dyeing differential-dyeing fibres
CA 1212107 A · Owner: Ciba Specialty Chemicals Holding Inc. · Inventors: Raisin, Helmut; Bouwknegt, Thys; Schutz, Hans U.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a process for the differential dyeing of such polyamide fibres and materials containing polyamide fibres as are made of components which differ in dyeability, or mixtures of polyamide fibres with dyes or dye, mixtures, which comprises using for dyeing these materials an aqueous liquor which contains a dye of the formula (1), in which A1 is hydrogen or C1-4-alkyl and R is a C2-5-alkanoyl C3-6-alkenoyl, phenoxycarbonyl, C1-4-alkylsulfonyl or phenylsulfonyl radical which can be substituted in the alkyl alkenyl, phenoxy or phenyl moiety, or a mixture of a dye of the formula (1) with a monosulfo-containing anthraquinone dye and to those, dyes of the formula (1) …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted September 30, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 30, 2003.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.