Copolyesters and molded articles comprising the same
CA 2189286 C · Owner: Kuraray Co. Ltd. · Inventors: Hara, Tetsuya; Tai, Shinji; Kashimura, Tsugunori
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Copolyesters consisting essentially of terephthalic acid units and ethylene glycol units, and further comprising 1 to 4 mole % of alicyclic or aliphatic bifunctional compound units (a,) or 0.5 to 7 mole % of bifunctional compound units (a2) derived from a specific aromatic diol or bifunctional compound units (a3) derived from a condensed ring or ring assembly type aromatic dicarboxylic acid 0.005, to 1 mole % of multi-functional compound units (b1) and a, specific amount of monofunctional compound units (c); copolyesters having a specific intrinsic viscosity and consisting essentially of terephthalic acid units and ethylene glycol units, and further comprising 0.5 to 7 mole % of the above …
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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
- Filed October 31, 1996 and granted May 30, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 31, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 31, 2018.
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Timeline
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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.