Piston ring
CA 1264170 C · Owner: Dana Corporation · Inventors: Bunce, Dean S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A parted annular piston ring having an outer periphery for engaging a cylinder wall of an internal combustion engine is disclosed. A band of hard wear-resistant material is secured in a groove which extends circumferentially completely around the outer periphery of the ring. The band is disposed axially between upper and lower narrow lands. An overlapping joint construction is provided at the parted ends of the ring and comprises mutually circumferentially overlappable surfaces inclined at an acute angle relative to the plane of the ring and terminating in the outer periphery of the ring along edges disposed in the upper land. The upper land is wider than the lower land, and the mutually …
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 January 2, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 2, 2007.
- 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.