Method for preparation of composite materials
CA 2046995 C · Owner: Schmidt, Erick · Inventors: Schmidt, Erick
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparing a composite from an intake material comprising a mixture of plastic and fibrous material comprises first granulating and sizing the material. The material is then heated in three consecutive phases, first at a temperature sufficient to achieve an internal temperature within the material of about 215 to 250 °F, then at a temperature sufficient to achieve an internal temperature within the material of about 250 to 320 °F and then at a temperature sufficient to achieve an internal temperature within the material of about 320 to 400 °F, wherein said material is continuously mixed during said heat phases. The material may then be co-extruded with a reinforcement structure …
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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 July 12, 1991 and granted February 16, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 12, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 12, 2013.
- 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.