Food container produced from polyester resin foam sheet
CA 2214570 C · Owner: Amano, Norio · Inventors: Taki, Takeshi; Amano, Norio; Hayashi, Motoshige
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A food container produced by laminating a non-foam film of a thermoplastic resin on at least one side of a foam sheet of a thermoplastic polyester resin to obtain a laminated sheet, and molding the laminated sheet into a container in such a manner that the non-foam film is positioned inside the container. The thermoplastic polyester resin foam sheet is produced by a process comprising melting a thermoplastic polyester resin mixing, the molten resin with a blowing agent and extruding the mixture into a low-pressure zone to carry out expansion molding, characterized in that a compound having two or more acid anhydride groups per molecule optionally, together with a compound of a metal of …
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 November 30, 1989 and granted April 11, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 30, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 30, 2011.
- 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.