Foamed core-reclaim multi-layer sheet and process for production thereof
CA 2054772 A1 · Owner: Pischke, Robert Duane · Inventors: Pischke, Robert Duane; Schubert, John Charles; Luetkens, Melvin Louis, Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention comprises a multi-layer thermoplastic foam sheet comprising a thermoplastic foam layer adjacent to at least one multi-resin layer, preferably comprising a reclaim material mixture recycled from the sheet manufacturing process and which comprises, a thermoplastic barrier resin. In a preferred embodiment the, multi-layer sheet (10) of the invention comprises a four major layer sheet comprising a barrier film layer which comprises a thermoplastic oxygen barrier resin (11); an inner multi-resin reclaim layer (12) comprising the oxygen barrier resin used in the barrier film layer; a foam core layer (13) adjacent to the inner multi-resin reclaim layer; and an outer multi-resin …
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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 March 7, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 7, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 7, 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.