Process for the mass colouration of polyesters
CA 1111167 A · Owner: Ciba Specialty Chemicals Holding Inc. · Inventors: Lienhard, Paul; Iqbal, Abul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, A process for the mass colouration of polyesters which comprises the use of a dye of the formula (I), wherein, B represents alkylene of 2 to 4 carbon atoms Y represents cycloalkyl of 5 to 6 carbon atoms aralkyl, of 7 to 14 carbon atoms or a substituted or unsubstituted carbocyclic or heterocyclic aromatic radical X represents cyanoalkyl of 1 to 5 carbon atoms or -B-OCO-Y, and, A represents an aromatic radical of the formula wherein R1 represents halogen, cyano, trifluoromethyl or alkylsulphonyl of 1 to 4 carbon atoms, and R2 represents hydrogen or halogen, or represents the group D-N=N-D'-, in which D and D' represent substituted or unsubstituted phenyl or …
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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 20, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 20, 1998.
- 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.