Process for dyeing polyesters in the melt
CA 1111166 A · Owner: Ciba-Geigy Investments Ltd. · Inventors: Wick, Arnold; Jost, Max
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for dyeing polyesters in the melt Abstract of the disclosure, Use of anthraquinone derivatives of the formula wherein X is -NH- or -S-, one Y is -NHCOR R being an alkyl, aryl or heterocyclic residue the other Y are hydrogen, Z is, halogen and n is 0, 1, 2 or 3, whereby Z may be 1 to 3 halogen bound to aryl and/or anthraquinone nucleus and/or the residue R, for dyeing polyesters in the melt.
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 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.