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Expired Canadian patentCanada

Method of and an apparatus for continuous heat treatment of separated elongated metallic material

CA 1138196 A · Owner: Elhaus, Friedrich W. · Inventors: Elhaus, Friedrich W.; Waschle, Manfred

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Abstract From the Canadian patent

In a method for continuous heat treatment of separated elongated metallic material said material is conveyed stepwise through a single furnace chamber. Said furnace chamber comprises a heating section and an adjacent holding section. In the heating section the material is heated up to a treating temperature and in the holding section the material is held at the treating temperature both in an atmosphere of forced circulation of hot gas common to both furnace sections. The temperature of the circulated hot gas is automaticcaly feedback-controlled at the location of the transition between the heating section and the holding section, the hot gas being set into forced motion in a single …

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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 28, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 28, 1999.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 20, 1979
GrantedDecember 28, 1982
Term endedDecember 28, 1999
Patent numberCA 1138196 A
Classification (IPC)C21D1/00 +2 more

Timeline

Timeline From CIPO dates

1980198219841986198819901992199419961998Application filedApril 20, 1979Patent grantedDec 28, 1982Term endedDec 28, 1999

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