Spherical rotary valve assembly for use in a rotary valve internal combustion engine
CA 2115502 C · Owner: Coates, George J. · Inventors: Coates, George J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A spherical rotary valve assembly for an internal combustion engine of the piston and cylinder type wherein the spherical rotary valve assembly is positioned within a split cylinder head having an upper and lower section such that when secured defines cavities for a rotational shaft having mounted thereon an intake drum and an exhaust drum for each cylinder the lower half of the split head having an inlet port and an outlet port in communication with each cylinder the cylinder head having an intake passageway and an exhaust passageway in communication with the drum cavities in the split cylinder head the split cylinder head having reservoir cavities positioned adjacent the intake drum and …
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 February 11, 1994 and granted December 14, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 11, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 11, 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.