Process for purifying exhaust gas and catalyst molded article for use in it
CA 2013100 C · Owner: Catalysts & Chemicals Industries, Co. Ltd. · Inventors: Fukuda, Morio; Hanada, Masayuki; Koshikawa, Takeo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An exhaust gas containing a nitrogen oxides is passed at a temperature of 250 to 550°C in the presence of a reducing agent through a catalyst bed filled with a molded denitration catalyst comprising at least the following three catalyst components, (A) an oxide of at least one metallic element selected from the group consisting of Ti Si and Zr. (B) an oxide of at least one metallic element selected from the group consisting of Mo and W, and, (C) an oxide of V, such that the concentrations of the oxide (B) and/or the oxide (C) in the exhaust gas inlet site of the catalyst bed are higher than in the other site thereof. The molded denitration catalyst is also described.
Read the whole patent
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
- Filed March 27, 1990 and granted May 30, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 27, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.