Recycling of barrier polystyrene foam scrap and barrier polystyrene foam containing recycled barrier polystyrene foam scrap
CA 2040611 C · Owner: Schirmer, Henry G. · Inventors: Schirmer, Henry G.; Read Flye, Susan; Gusavage, Gerald G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A barrier foam tray contains recycled reclaim of barrier foam. The tray comprises a sheet of foamed polystyrene ( PS ) having laminated to it a flexible barrier film. The foamed polystyrene part can have admixed therein from 0:0001 % up to 30% by weight of the flexible barrier film. The barrier film contains a barrier polymer such as ethylene vinyl alcohol copolymer ( EVOH ). The tray is made by grinding laminate scrap and extruding reclaim therefrom with virgin polystyrene.
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 April 16, 1991 and granted October 16, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 16, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 16, 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.