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Expired Canadian patentCanada

Process of carbonizing wood to produce wood charcoal

CA 1311708 C · Owner: Dreher, Ingo · Inventors: Schmalfeld, Jorg; Weiss, Hans-Jurgen; Arnhold, Johannes

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Abstract From the Canadian patent

A process of carbonizing wood in a moving bed shaft reactor, which is flown through by hot rinse gas and is charged with the wood at the top and wood charcoal is withdrawn from the lower portion of the reactor. An exhaust gas which contains gases and vapors produced by the carbonization is withdrawn from the top end of the shaft reactor and is directly fed to a combustion chamber and combustion gases from the combustion chamber are used as hot rinse gas in the shaft reactor. The combustion chamber is separated from the shaft reactor and is provided with a first and a second section, the exhaust gas is combusted in the first section of the combustion chamber with air at an …

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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 22, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 22, 2009.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 14, 1989
GrantedDecember 22, 1992
Term endedDecember 22, 2009
Patent numberCA 1311708 C
Classification (IPC)C10B49/06 +1 more

Timeline

Timeline From CIPO dates

1990199219941996199820002002200420062008Application filedJune 14, 1989Patent grantedDec 22, 1992Term endedDec 22, 2009

Sources & verification

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