Catalyst for purifying exhaust gas and a process for purifying exhaust gas
CA 2223458 C · Owner: Gotoh, Hideki · Inventors: Gotoh, Hideki; Okumura, Akihisa; Horiuchi, Makoto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An exhaust-gas-purifying catalyst is made by depositing on a support iridium serving as a catalyst active substance sulfur for improving the catalyst activity of iridium and if necessary, platinum. The sulfur is preferably contained as a sulfate. The exhaust-gas-purifying process of the present invention is a process in which exhaust gas from an internal combustion engine is allowed to pass through the exhaust-gas-purifying catalyst with the exhaust-gas temperature being set in the range of 200°C to 700°C at the inlet of the exhaust-gas-purifying catalyst. The abovementioned composition and process provide an activity for purifying exhaust gas, especially for eliminating nitrogen oxides in …
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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 April 9, 1997 and granted June 18, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 9, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 9, 2019.
- 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
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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.