Resinous composition for coating use
CA 1318075 C · Owner: Kasawa, Susumu · Inventors: Kasawa, Susumu; Kojima, Akihiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mo-3158, LeA 25,530, A PROCESS FOR THE PRODUCTION OF POLYNUCLEAR AROMATIC POLYAMINES, ABSTRACT OF THE INVENTION This invention relates to an improved process for the preparation of polynuclear aromatic polyamines in which the, reaction product is prepared by condensing aniline with fonmaldehyde in the presence of water and acjdic catalysts and is worked up by extraction with a hydrophobic solvent. The acid catalyst that accumulates in the aqueous phase during the extraction process is reused. Le A 25 530
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 May 18, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 18, 2010.
- 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.