Water-soluble disazo dyestuffs, a process for their preparation and their use for dyeing synthetic and natural polyamides
CA 1064022 A · Owner: Hoechst Aktiengesellschaft · Inventors: Filzinger, Klaus; Fuchs, Hermann
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
New water-soluble disazodyestuffs of the formula in which R1 represents the methyl, ethyl .beta.-hydroxyethyl or, .beta.-cyanoethyl group and R2 stands for a phenyl radical whereby, the radical -OR1 stands in ring A in 2- or in 4- position to the azo group, and their salts had been found which are very well suitable for dyeing of synthetic and natural polyamides and yield dyeings on these fibres with good to very good wet fasteness and fastnesses to processing and to use. Furthermore they possess a very good dyeing behaviour.
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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 October 9, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 9, 1996.
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Timeline
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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.