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Expired Canadian patentCanada

Catalyst and a method for denitrizing nitrogen oxides contained in waste gases

CA 1297470 C · Owner: Mitsubishi Jukogyo Kabushiki Kaisha · Inventors: Nagano, Kazuhiko; Rikimaru, Hiroaki; Nakatsuji, Tadao

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Abstract From the Canadian patent

A catalyst for denitrizing nitrogen oxides contained in waste gases, which comprises:, (a) titanium and, (b) at least one base metal selected from the group consisting of Y, W, Mo, Mn, Cu, Fe, Cr Co, Ni, Zn and Sn, the catalyst containing titanium and the base metals in amounts of at least about 50 % by weight in terms of oxides based on the catalyst, and titanium in amounts of about 80-99 % by weight in terms of oxides and the base metals in amounts of about 20-1 % by weight in terms of oxides, respectively based on, the total weight in terms of oxides of titanium and the base metals, and the catalyst having micropores of about 50-75000 .ANG. in radius in amounts of about 0.25-0.45 ml/g …

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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 March 17, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 17, 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.
FiledSeptember 29, 1987
GrantedMarch 17, 1992
Term endedMarch 17, 2009
Patent numberCA 1297470 C
Classification (IPC)B01J35/10 +2 more

Timeline

Timeline From CIPO dates

19881991199419972000200320062009Application filedSep 29, 1987Patent grantedMarch 17, 1992Term endedMarch 17, 2009

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