Method and apparatus for forming high-impact, transparent, distortion-free polymeric materials
CA 2457737 C · Owner: Tinney, Rodney M. · Inventors: Oakey, Edwin J.; Tinney, Rodney M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus are provided for forming a sheet (16) of polymeric material, such as polycarbonate. A forming mold (10) is provided having halves (12, 14) that engage for forming a heated sheet (16) therebetween. Each of the halves (12, 14) defines an interior cavity (18 22) having a peripheral edge. , The sheet (16) is retained between the peripheral edges (34-40 52-58) of the , halves (12, 14) and a vacuum (60) is generated within one of the cavities for drawing the sheet therein, whereby a sensing mechanism (80) detects a draw depth for initiating a cooling mechanism (20) to cool the sheet to a temperature below a glass transition temperature of the material. A series of …
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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 August 13, 2002 and granted June 12, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 13, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 13, 2024.
- 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
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.