Process and device for manufacturing a plastic preform
CA 2566044 C · Owner: Denis, Gerard · Inventors: Denis, Gerard; Didier, Eric
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 process for manufacturing a preform from a semicrystalline amorphous polymer at a slow rate of crystallization in, which:, - the said polymer is plasticized at (3) by rapidly raising its temperature to a temperature below the melting point;, - the said plasticized polymer is pressed through a die (4) ;, - on leaving the die, the said polymer is swept by a hot dry inert gas (11);, - the plasticized polymer is received in a first container (6), while keeping the polymer at the same temperature as the plasticizing temperature in all the steps; and, - a die pressing step (13) is carried out in the said first container or in a second container transferred from …
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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 May 10, 2005 and granted March 6, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 10, 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.