Microporous polypropylene film and manufacturing method for same
CA 2772028 C · Owner: Toray Industries, Inc. · Inventors: Ohkura, Masatoshi; Fukushima, Hajime; Masuda, Jun'Ichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a microporous polypropylene film where film formability is improved in accordance with a .beta.-crystal technique which allows microporous films to be continuously manufactured at low cost. In addition a microporous polypropylene film of which the specific gravity is further reduced is provided. Furthermore a microporous polypropylene film with a significantly high permeability is provided. In addition manufacturing methods for these microporous polypropylene films are provided. As for the means for solving the above a microporous polypropylene film comprising a polypropylene with the Trouton ratio of not less than 30 a microporous polypropylene film with the …
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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 April 21, 2005 and granted May 28, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 21, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
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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.