Foamable resin composition and a thermoplastic foamable pattern and metal casting manufacturing method using said composition
CA 2063464 C · Owner: Foseco International Ltd. · Inventors: Simmons, William; Shibata, Hideaki; Kato, Yoshiyuku
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are a foamable resin composition which comprises a copolymer with a weight-average molecular weight of 150,000 - 350,000 produced by copolymerization of a monomer mixture of 55 - 85% by weight of,styrene and 45 -15% by weight of a methacrylic acid ester represented by general formula (I), CH2=C (CH3)COOR ....... (I) (wherein R represents a C1-4 alkyl group) and, having impregnated therein, 10% by weight or less of a foaming agent relative to said monomer mixture a thermoplastic foamable pattern which is constituted by heating, foaming and molding of a foamable resin composition as claimed in Claim 1, a metal casting manufacturing method which comprises a stage wherein a …
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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 19, 1992 and granted December 17, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 19, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 19, 2014.
- 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
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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.