Phthalonitrile terminated polyaryloxypyridine oligomer compositions; process for preparing them and their use for the preparation of polyaryloxypyridine co- polyphthalocyanines; lattices thus obtained

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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 May 22, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 22, 2007.
• We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.