Polyesters, polyester compositions, polyester laminates and processes for producing biaxially stretched polyester bottles
CA 2215035 C · Owner: Mitsui Petrochemical Industries, Ltd. · Inventors: Hiraoka, Shoji; Kouya, Masahiro; Nakamachi, Koji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The novel polyester (first polyester A) of the invention comprises dicarboxylic acid constituent units derived from at least one dicarboxylic acid selected from terephthalic acid, isophthalic acid and naphthalenedicarboxylic acid and diol constituent units derived from diols comprising ethylene glycol and a polyalkylene glycol having a C2 - C10 alkylene chain wherein the proportion of constituent units derived from the polyalkylene glycol is 0.001 to 10 % by weight based on the diol constituent units. The polyester A has an excellent crystallization rate, is suitably used singly or, as compositions together with another polyester B and/or other polymers, for production of molded products …
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
- Filed February 18, 1997 and granted July 8, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 18, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 18, 2019.
- 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.