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Expired Canadian patentCanada

Chitin as an extender and filter for tobacco

CA 1078159 A · Owner: University Of Delaware · Inventors: Austin, Paul R.

CIPO record

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Abstract From the Canadian patent

Abstract of the Disclosure, Chitin, either as such or in toasted form has been, found to be an effective extender and filter for tobacco. It can be used in substantial amounts with tobacco blends without adversely affecting such physical properties as packing ability, burning rate or retention of ash. Organoleptic properties such as saroma, taste and smoothness are little affected. To the degree that chitin is used in the mixture, nicotine and noxious tars are reduced. Mixtures of chitin and tobacco represent now compositions.

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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 May 27, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 27, 1997.
  • 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—
GrantedMay 27, 1980
Term endedMay 27, 1997
Patent numberCA 1078159 A
Classification (IPC)A24B15/10 +2 more

Timeline

Timeline From CIPO dates

198119831985198719891991199319951997Patent grantedMay 27, 1980Term endedMay 27, 1997

Sources & verification

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