Azomethine compound pigment
CA 1068053 A · Owner: Hoechst Aktiengesellschaft · Inventors: Papenfuhs, Theodor
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mixtures of mono- and disazomethine compounds are obtained by reacting 1.2 to 2.5 mols of an optionally substituted m-phenylene diamine with 2 mols of one or more optionally substituted 2-hydroxy-1-naphthaldehydes. The products are pigments having superior properties than the components.
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 18, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 18, 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.