Internal combustion engine
CA 2183306 C · Owner: Sunley, Clarence Lavern · Inventors: Sunley, Clarence Lavern
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An internal combustion engine has an annular engine chamber in which a set of pistons oscillate in synchronism. On their compression stroke, the pistons draw in a fresh charge into the chamber behind the piston. On the power stroke, that charge is compressed and released into the next following combustion chamber. The engine geometry is selected to provide a a compression stroke that is shorter in duration than the combustion stroke.
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 August 14, 1996 and granted August 3, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 14, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 14, 2018.
- 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.