Wholly aromatic polyamides, processes for preparing them and structures formed from them
CA 1322428 C · Owner: Keil, Gunter · Inventors: Klein, Peter; Keil, Gunter; Heinrich, Karl
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the disclosure HOE 88/F 296 Wholly aromatic polyamides, processes for preparing them and structures formed from them. Aromatic copolyamides soluble in organic polyamide, solvents comprise at least 95 mol% of the recurrent structural units of the formulae, A -OC-Ar-CO- B -HN-Ar'-NH-, C : , D : , and up to 5 mol% of structural units containing m-bonds. Here Ar- and -Ar'- are divalent, unsubstituted or substituted aromatic radicals, the valency bonds of which are in the para-position or in a comparable coaxial or parallel position, and -R is a lower alkyl radical.
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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 September 21, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 21, 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.