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Expired Canadian patentCanada

Multilayer moulded plastic with pullulan layer

CA 1049390 A · Owner: Sumitomo Chemical Company Limited · Inventors: Tsuji, Kozo; Toyota, Nobuhiro; Fujita, Fumio

CIPO record

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

A multilayered molded plastic is provided having at least one layer comprising pullulan and a plastic layer or pullulan modified by esterfication, alkyl etherfication or hydroxyalkyl etherfication or a paper or aluminum foil layer. The molded plastic is low in gas permeability transparent, high, in strength and non-toxic. The plastic is thus useful as a packing material particularly in the packaging of easy putrefactive foodstuffs such as fish, meat, dairy products soy sauce, miso, mayonnaise and various processed and frozen foods.

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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 February 27, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 27, 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.
Filed—
GrantedFebruary 27, 1979
Term endedFebruary 27, 1996
Patent numberCA 1049390 A
Classification (IPC)B32B9/04 +2 more

Timeline

Timeline From CIPO dates

198019821984198619881990199219941996Patent grantedFeb 27, 1979Term endedFeb 27, 1996

Sources & verification

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.