Azomethine dyes for polypropylene
CA 1068684 A · Owner: American Color And Chemical Corporation · Inventors: Botros, Raouf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Azomethine dyes of the formula in which A represents a diazotizable aromatic hydrocarbon. In particular, A is an optionally substituted benzene or naphthalene radical. B is an optionally substituted salicylaldehyde or o-hydroxy-naphthaldehyde nucleus and C is an optionally substituted pyridine nucleus. Metal-modified polypropylene dyed with the azomethine dye has excellent fastness properties.
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 December 25, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 25, 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.