Compression molding process
CA 2248262 C · Owner: Valyi, Emery I. · Inventors: Valyi, Emery I.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compression molding process for forming an article preferably a preform or , closure, is provided. The process includes the steps of forming thermoplastic resin into a precursor (10), wherein the precursor fits in a compression mold (12) and has a shape for allowing the precursor to be supported in a predetermined or dimensionally preheld manner (23) in a cavity of the compression mold prior to being compressed into a final shape which shape is , the shape of the compression mold; heating the precursor (10); and compression molding the precursor into the article (18) while said precursor is heated. The step of forming may include the steps of extruding the resin into sheets (20); …
Read the whole patent
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 February 25, 1997 and granted October 30, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 25, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 25, 2019.
- 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.