Water-soluble, yellow reactive dyes, process for their preparation and their utilization
CA 1051422 A · Owner: Hoechst Aktiengesellschaft · Inventors: Meininger, Fritz; Bauer, August; Hoyer, Ernst
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
NEW WATER-SOLUBLE, YELLOW REACTIVE DYES? PROCESS FOR THEIR PREPARATION AND THEIR UTILIZATION, Abstract of the disclosure: Compounds which, in the form of the free acid correspond, to the general formula (1) in which A,A', B and B' each represent radicals of the benzene-, naphthalen- or heterocyclic series which may be identical or different, D and D' each represent a bivalent bridge member, which may be identical or different, X stands for a group which is linked to A, A', B and/or B' and corresponds to the formula, -SO2-CH2-CH2-Y or, -SO2-CH=CH2 in which Y stands for a radical which can be split off by alkaline agents or for a hydroxyl group m and m1 is, zero or the integer 0 to 1 the sum …
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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 March 27, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 27, 1996.
- 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.