Composite material having an expanded, cured epoxy resin layer, method of producing same and powder epoxy resin composition for forming such an expanded layer
CA 2074888 A1 · Owner: Osa, Mikio · Inventors: Watanabe, Takeshi; Iwamoto, Seitaro; Kitagawa, Katsuji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composite material having a substrate and an expanded, cured layer of an epoxy resin composition which is provided over a surface of the substrate and in which a major portion of the cells are present in a location adjacent to the interface between the substrate and the expanded layer and substantially no cells are present on the top surface portion of the expanded layer. The epoxy resin composition includes an acid anhydride-curing agent and an alkali metal carbonate blowing agent. The composition is coated over the substrate and the coating is heated to cure and expand the composition while maintaining the top surface of the coating below the expansion temperature.
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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 July 29, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 29, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 29, 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
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.