Process for producing copolymer films
CA 1211264 A · Owner: Mitsui Toatsu Chemicals, Inc. · Inventors: Shishido, Shigeyuki; Naito, Mituyuki; Ibi, Akira
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, A process for producing polyamide-polyimide block copolymer films or polyamide-polyimide copolymer films having excellent thermal resistance and mechanical strength, which comprises casting a solvent solution of a polyamide-polyamide acid block copolymer or a polyamide-polyamide acid copolymer on a substrate, converting the deposited thin layer of the solution into a self-supporting film, regulating the residual solvent content of the film by heating or other means, if necessary, and then heating the film at a temperature of 320° to 500°C for a specified period of time.
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 September 16, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 16, 2003.
- 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.