Exhaust gas purifying catalyst and an exhaust gas purifying method using the catalyst
CA 2060229 A1 · Owner: Petroleum Energy Center · Inventors: Hayasaka, Toshiaki; Kimura, Takuma
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A catalyst for purifying an exhaust gas comprises at east gallium as a main catalyst and a fire resistant oxide except for zeolite) as a support. A method of reducing and eliminating a nitrogen oxide in an exhaust gas in the presence of a hydrocarbon having a ratio of an overall THC concenration/NOx concentration of 0.5 - 50 at a reaction temperature of 200 - 800°C in an oxidative atmosphere.
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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
- Filed January 29, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 29, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 29, 2014.
- 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.