Four-cycle engine
CA 2135540 C · Owner: Kawasaki Jukogyo Kabushiki Kaisha · Inventors: Yamane, Yoshiro; Tamba, Shinichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Teeth on an outer circumferential surface of a drive gear rotatable with the crankshaft of a four-cycle engine engage teeth on an inner circumferential surface of a cam gear. The cam gear has twice as many teeth as the drive gear. Cams, formed on an outer surface of the cam gear, are connected with valve actuating mechanisms to open and close exhaust and intake valves of the engine. The cam and drive gears may also function together as an oil pump.
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 November 10, 1994 and granted December 15, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 10, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 10, 2016.
- 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.