Foamed extrusion board of mixed resin comprising modified polypropylene resin and polystyrene resin
CA 2316932 A1 · Owner: Tomita, Haruo · Inventors: Tomita, Haruo; Miyama, Osamu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An extrusion-foamed polypropylene resin board which is thick and has a high percentage of closed cells, a small average cell diameter and a low density. , A resin blend obtained by blending (a) 50 to 95 parts by weight of a polypropylene resin having a melt tension at 230 ~C of 0.05 N or higher with (b) 50 to 5 parts by weight of a polystyrene resin and (c) 0.5 to 15.0 parts by weight, per 100 parts by weight of the sum of the resins (a) and (b) of a , hydrogenated styrene/isoprene/styrene block copolymer is mixed with a foaming agent with an extruder and then extruded into a low-pressure zone. Thus an , extrusion-foamed object having a density of 50 to 10 kg/m3 and a percentage 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 November 9, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 9, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 9, 2021.
- 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.