Polyester filamentary yarn, polyester tire cord and production thereof
CA 2085178 C · Owner: Kim, Hongjo · Inventors: Kim, Hongjo; Kim, Kyeoghyeon; Kim, Hagmug
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polyester multi-filamentary yarn having a novel internal microstructure, a polyester tire cord produced from the yarn and a process for production thereof are provided. The polyester yarn of the present invention has a novel three-phase microstructure consisting of crystalline amorphous, and mesomorphous portions which will be changed to in the, formation of a tire cord, a definite structure of crystalline and amorphous portions. The polyester resin comprising at least 90 mol% polyethylene therephthalate is melt-spun and solidified by quenching to produce a undrawn yarn with a birefringence of 0.03 to 0.08 which is then drawn at a total draw ratio of 1.4: 1 to 2.2: 1 and thermally treated …
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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 December 11, 1992 and granted January 5, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 11, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 11, 2014.
- 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.