Fibre-reactive dyes, their manufacture and use
CA 1063600 A · Owner: Ciba-Geigy Ag · Inventors: Hegar, Gert; Seiler, Herbert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Fibre-reactive dyes of the formula (?) , wherein A1 is the radical of a chromophore of the anthraquinone, azo, phthalocyanine or nitroaryl series which contains sulpha groups, A2 is hydrogen or an organic radical, B is an alkylene or arylene radical and each of R1, R2, R3 and R4 independently is hydrogen or alkyl.
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 2, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 2, 1996.
- 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.