Method for producing polypropylene resin article having skin material lined with foamed layer
CA 2053194 C · Owner: Matubara, Shigeyoshi · Inventors: Matsumoto, Masahito; Hara, Takahisa; Matubara, Shigeyoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a multi-layer molded article which is made of a polypropylene resin body and a skin material lined with a foamed layer. The article has a good appearance and is produced using upper and lower molds which have a cavity therebetween. A specific cavity clearance is freely set between the molds, a skin material lined with a foamed layer is placed between the upper and lower molds and, a molten polypropylene resin containing a chemical blowing agent is supplied through a resin melt conduit into the lower mold when the cavity clearance (t) is between (C + 15) mm and (C + 50) mm where "C" is a thickness of the skin material lined with the foamed layer, lowering the …
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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 October 10, 1991 and granted February 19, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 10, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 10, 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.