Multi-layer composite paper and method of producing the same
CA 1053045 A · Owner: Rengo Co. · Inventors: Tokuno, Masateru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Title of the Invention, Multi-layer composite paper and method of producing the same Abstract of the Disclosure, A method is provided for the production of a multi-layer composite paper, which comprises preparing a substrate layer comprising a cellulosic fiber and a thermoplastic resin the, proportion of which is at least 15 weight percent of the combined dry weight of said fiber and resin and an exterior layer comprised of a cellulosic fiber as formed in superimposition on at least one side of said substrate layer in a web-forming stage and pressing the resultant composite web formation under heating at a temperature not less than the softening point of said thermoplastic resin. 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
- Granted April 24, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 24, 1996.
- 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.