Monoazo dyes
CA 1072085 A · Owner: Imperial Chemical Industries Limited · Inventors: Ridyard, Denis R. A.; Brierley, David; Yelland, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Water-soluble monoazo dyes for nylon having the formula: wherein ring A may optionally be substituted by halogen trifluoromethyl, alkoxy, acylamino or alkyl having from 1 to .4 carbon atoms R represents, hydrogen or unbranched alkyl having from 1 to 4 carbon atoms R1 represents, hydrogen, alkyl or hydroxyalkyl X represents unbranched alkyl having, from 1 to 6 carbon atoms cycloalkyl, halogen, nitro, trifluoromethyl sulpho, vinylsulphonyl, hydroxyethylsulphonyl sulphatoethylsulphonyl, -SO2NHR2, wherein R2 represents hydrogen or alkyl having from 1 to 4 carbon atoms, or -COOR3 wherein R3 represents hydrogen alkyl having from, 1 to 7 carbon atoms cycloalkyl or aryl, and n represents an integer …
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 February 19, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 19, 1997.
- 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.