Azo dyes, processes for producing them, and their use
CA 1109063 A · Owner: Koller, Stefan · Inventors: Aeschlimann, Peter; Koller, Stefan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
New disperse azo dyes are disclosed which correspond to the formula, wherein, X represents halogen R1 represents unsubstituted alkyl, substituted alkyl or cycloalkyl, R2 represents unsubstituted lower alkyl and, R3 represents unsubstituted or substituted lower alkyl which dyes are useful for dyeing and printing synthetic fibres especially those containing ?ster groups particularly, polyester fibres.
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 September 15, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 15, 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.