Method of purifying exhaust gas of internal combustion engine and apparatus thereof
CA 2255889 C · Owner: Oono, Hiroshi · Inventors: Kuroda, Osamu; Yamashita, Hisao; Kitahara, Yuichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a method of and an apparatus for purifying the exhaust gas of an internal combustion engine. The invention is comprised of an NOx purifying catalyst arranged in an exhaust gas passage The NOx, purifying catalyst is made of a composite material containing at least one kind of element selected from alkaline metals and alkaline earth metals, at least one kind of element selected from rare earth metals, at least one kind of element selected from platinoid metals, and titanium (Ti). The NOx purifying catalyst adsorbs NOx in the exhaust gas onto the surface when the exhaust gas is lean, and reduces the adsorbed NOx to N2 when the exhaust gas is stoichiometric or …
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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 December 7, 1998 and granted October 22, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 7, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 7, 2020.
- 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.