Honeycombed thermoplastic resin profile - extrusion apparatus for obtaining profile and making process of same
CA 2059118 C · Owner: Prevotat, Bernard · Inventors: Prevotat, Bernard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a section of cellular structure made of thermoplastic resin in which the cells are arranged substantially perpendicular to the axis of the section. The section is made with an extrusion apparatus consisting of an extrusion head and extrusion tooling of which the extrusion head is divided into three channels substantially superimposed opening substantially into the corresponding three channels of the extrusion tooling and at the opposite end being connected with the feed conduit of at least one extrusion device the two outer channels being used to carry the material constituting the outer walls of the section or tube and the intermediate channel being used to carry 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 January 9, 1992 and granted December 1, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 9, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 9, 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.