Method for manufacturing polyamide resin
CA 1320610 C · Owner: Tanaka, Masanori · Inventors: Yoneyama, Masaru; Tanaka, Masanori; Imai, Yoshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is concerned with a method for manufaturing a polyamide resin having double bonds in its main chain and comprising repeated units of the formula (I):, -Ar1-CR1=CR2-CO-NR3-R4-NR3-CO-CR2=CR1- (I) wherein Ar1 is a bivalent aromatic radical R1, R2 and R3, identical or different, each represent a hydrogen atom or a univalent aromatic or aliphatic radical and R4 is a bivalent aromatic or aliphatic radical the polyamide, resin having a reduced viscosity (?sp/c) of 0.1 - 5.0 dl/g at a concentration of 0.5 g/dl in N,N-dimethylacetamide at 30°C. The method according to the invention is characterized in that a bis-alkenoic amide having the general formula (II):, …
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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 July 20, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 20, 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.