Variable cross section extruding die and variable cross section extrusion molding method
CA 2188249 C · Owner: Sano, Shigeo · Inventors: Kato, Masatsugu; Sano, Shigeo; Hiyoshi, Yasumasa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A variable cross section extruding die comprises a die for varying an area of an extrusion molding hole provided movably in a direction perpendicular to a direction in which a molding material is extruded for extrusion of the molding material and a mandrel provided in the extrusion molding hole in such a manner as to freely move back and forth in the above extruding direction and having a tapered portion on its outer circumferential portion tapered such that the outer diameter thereof gets gradually smaller from one of the back and forth directions to the other. With this variable cross section extruding die, while a molding material is being pressed against the die, the die is moved such …
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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 14, 1996 and granted October 14, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 14, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 14, 2018.
- 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.