Process for producing aromatic polyamide
CA 1197346 A · Owner: Sumitomo Chemical Co. Ltd. · Inventors: Miyashita, Akira; Nagaoka, Kenji; Ueno, Katsuji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An aromatic polyamide having a high molecular weight is produced by a polycondensation reaction of an aromatic aminocarboxylic acid and/or a mixture of an aromatic dicarboxylic acid and an aromatic diamine in a polar solvent in the presence of a dehydrating catalyst with heating at a temperature of about 160°C or higher.
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 November 26, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 26, 2002.
- 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.