Manufacture of piston rings
CA 1183741 A · Owner: Wedge, Robert · Inventors: Tanner, John E.; Wedge, Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
John Ernest TANNER and Robert WEDGE, ABSTRACT, A method of treating piston rings to render them extremely hard-wearing, wherein the rings are assembled in batches on a tubular mandrel which is then surrounded by a matching cylinder, the mandrel bearing the rings and the cylinder being subjected to relative cyclical motion while a slurry of hard silicon carbide particles is poured into the cylinder. Either the wall of the tubular mandrel or the wall, of the cylinder, or both, are provided with holes to allow the slurry to flow away. The cyclical motion may consist of relative rotation at 170 r.p.m. and simultaneous relative reciprocation at 5 cycles per minute. The slurry may consist of 220 …
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 March 12, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 12, 2002.
- 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.