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Expired Canadian patentCanada

Exhaust gas processing apparatus for paint drying oven

CA 1313825 C · Owner: Toyota Jidosha Kabushiki Kaisha · Inventors: Akiyama, Shunichi; Yoshimoto, Taisuke; Suzuki, Kenichirou

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

An exhaust gas processing apparatus for a paint drying oven of this invention comprises a reaction container; a first catalyst layer disposed at upstream side of the reaction container comprising a support of a honeycomb substance or a foamed substance, a carrier layer formed on the support and a platinum group elements catalyst loaded on the carrier layer; a second catalyst layer disposed downstream of the first catalyst layer comprising a support of a pellet substance a honeycomb substance, or a foamed substance and a platinum group elements catalyst; and a third catalyst layer disposed downstream of the second catalyst layer comprising a support, a carrier layer formed on the support and …

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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 February 23, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 23, 2010.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledOctober 25, 1988
GrantedFebruary 23, 1993
Term endedFebruary 23, 2010
Patent numberCA 1313825 C
Classification (IPC)B01J8/04 +1 more

Timeline

Timeline From CIPO dates

19891992199519982001200420072010Application filedOct 25, 1988Patent grantedFeb 23, 1993Term endedFeb 23, 2010

Sources & verification

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