Method for producing transparent polypropylene based sheet and transparent polypropylene based sheet
CA 2560926 C · Owner: Idemitsu Unitech Co. Ltd. · Inventors: Akamatsu, Masahiro; Funaki, Akira; Kitajima, Tomoyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a transparent polypropylene based sheet and its , manufacturing method capable of. providing proper properties as a transparent sheet such , as tensile characteristic impact resistance, rigidity and little generation of whitening when , being folded as well as maintaining transparency; preventing generation of a gum-like , material in molding; and realizing continuous production. A manufacturing machine 1 , includes: an extruding unit 11 for melting and kneading a raw material and extruding the , material into a sheet-like shape; a first cooling unit 12 for cooling the melted sheet-like , resin composition 20a to obtain a sheet (sheet-like article) …
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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 March 24, 2005 and granted October 2, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 24, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.