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Expired Canadian patentCanada

Process for providing tobacco extender material

CA 1280947 C · Owner: Reynolds (R.J.) Tobacco Company · Inventors: Graves, William H. Jr.; Leonard, Gerard E.

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

Tobacco extender material is provided in sheetlike form by contacting tobacco material and/or carbonized material in substantially dry form with a binding agent in substantially dry form and then, subjecting the mixture to a high rate of shear agitation in the presence of a relatively low moisture content. The material so processed is further processed using dry forming techniques in order to provide sheets of reconstituted tobacco material and sheets of carbonized material. The sheets of tobacco extender can be cut to the desired size and is useful in the manufacture of cigarettes.

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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 March 5, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 5, 2008.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 13, 1987
GrantedMarch 5, 1991
Term endedMarch 5, 2008
Patent numberCA 1280947 C
Classification (IPC)A24B3/14 +1 more

Timeline

Timeline From CIPO dates

1988199119941997200020032006Application filedMarch 13, 1987Patent grantedMarch 5, 1991Term endedMarch 5, 2008

Sources & verification

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