Dynamic valve mechanism of internal combustion engine
CA 2014696 C · Owner: Machino, Atsumi · Inventors: Machino, Atsumi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A dynamic valve mechanism in an internal combustion engine for opening and closing a valve by swinging a rocker arm in accordance with rotation of a cam shaft. The valve mechanism includes a rocker shaft for swingably supporting the rocker arm, a positioning portion fixedly mounted on the rocker arm and projecting in the axial direction of the rocker shaft and a thrust, bearing portion mounted on the cylinder head for supporting the rocker shaft through a holding portion thereof and projecting toward the rocker arm side in order to position the rocker arm by contact with the positioning portion.
Read the whole patent
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 17, 1990 and granted December 21, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 17, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 17, 2012.
- 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.