Exhaust emission control device
CA 2061745 C · Owner: Okahara, Hiroyuki · Inventors: Akitsu, Yasuo; Masaki, Hideyuki,; Okahara, Hiroyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An exhaust emission control device includes a single fliter assembly composed of a pair of side plates respectively formed in an L-letter shape in cross-section and integrally assembled in a square framework having inlet and outlet openings, and a plurality of ceramic filter elements aligned in parallel within the square framework and clamped by the side plates, the filter elements each being made of porous ceramic material and having a thin-walled cellular structure of square in cross-section formed with a plurality of axially extending passages separated from each other by thin partition walls wherein a first, group of the passages are closed at their one ends in a checked pattern 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 February 24, 1992 and granted September 9, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 24, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 24, 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.