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Expired Canadian patentCanada

Method of treating a foodstuff to inhibit the development of mutagens and carcinogens

CA 1333454 C · Owner: Weissburger, John H. · Inventors: Jones, Ronald Conrad; Weissburger, John H.

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

L-Tryptophan is applied to foodstuff to prevent the development of mutagens/carcinogens. Before the cooking of a foodstuff such as hamburger L-Tryptophan is, applied to the surfaces thereof to inhibit for example, the generation of IQ type carcinogens. The L-Tryptophan can be sprinkled on the surface of the foodstuff or incorporated into a sauce which is applied to the foodstuff or put into solution in water or the like. Other non-toxic indoles such as L-proline have identical properties in specifically blocking the formation of heterocyclic amino type mutagens and carcinogens as do, mixtures of L-tryptophan and L-proline.

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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 December 13, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 13, 2011.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJanuary 6, 1989
GrantedDecember 13, 1994
Term endedDecember 13, 2011
Patent numberCA 1333454 C
Classification (IPC)A23L29/00 +2 more

Timeline

Timeline From CIPO dates

19901993199619992002200520082011Application filedJan 6, 1989Patent grantedDec 13, 1994Term endedDec 13, 2011

Sources & verification

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