Catalyst for purifying exhaust gas from internal combustion engine and purifying method thereof
CA 2219367 C · Owner: Doi, Ryouta · Inventors: Azuhata, Shigeru; Kitahara, Yuichi; Doi, Ryouta
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a catalyst being formed of a porous supporter supporting alkali metals Ti, and noble metal, or further supporting at least one of a rare earth metal and magnesium, being disposed in a flow passage of an internal combustion engine and being used to, purify NOx contained in the exhaust gas. The catalyst of the present invention has excellent NOx resistance not only to the exhaust gas burnt with a stoichiometric air-to-fuel ratio or rich conditions, but to the exhaust gas burnt with the lean conditions, and furthermore has a high resistivity to poisoning of SOx slightly contained in the fuel.
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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 October 24, 1997 and granted February 27, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 24, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 24, 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
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.