Piston ring
CA 1088971 A · Owner: Mcquay-Norris Inc. · Inventors: Grimm, Raymond L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved piston ring has at least one pumping means including a hydrodynamic cavity in a lower face of the ring. The hydrodynamic cavity traps oil, and the pumping means forces the oil to the underside of the ring and out of the ring groove to the clearance space between the piston and the engine cylinder bore, minimizing the amount of oil permitted to reach the combustion chamber.
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
- Granted November 4, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 4, 1997.
- 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.