Process for dyeing or printing aromatic polyamide fibres
CA 1070905 A · Owner: Ciba-Geigy Ag · Inventors: Soiron, Charles; Keller, Karlheinz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for dyeing or printing aromatic polyamide fibres with cationic dyes in aqueous medium, wherein the medium contains, (a) a carrier which contains no ketoneforming carbonyl groups, and, (b) an anionic assistant. The process of the invention is especially suitable to obtain wilt cationic dyes dyeings having a colour yield of 2 to 10 times greater than that obtained by using the same dye liquor but without the addition of any anionic assistant.
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 5, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 5, 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.