Improved diesel exhaust filter
CA 2533697 C · Owner: Swartzmiller, Steven B. · Inventors: Ziebarth, Robin; Li, Cheng G.; Cornell, Martin C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved Diesel exhaust filter element of the type having a rigid porous wall portion formed of an acicular ceramic (such as acicular mullite) the , porous wall portion having a first side and a second side the porous wall , portion being coated with a precious metal catalyst and a Nox absorbent such , that when exhaust gas from a Diesel engine is flowed through the rigid porous wall from the first side to the second side the exhaust gas containing excess , oxygen Nox and soot, the soot in the exhaust gas in trapped within the rigid porous wall and catalytically oxidized to carbon dioxide the NO is , catalytically oxidized to NO2 which NO2 is then absorbed by the Nox absorbent, and …
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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 August 27, 2004 and granted February 12, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 27, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 27, 2026.
- 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.