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Expired Canadian patentCanada

Bearing clearance detector/probe

CA 1287971 C · Owner: Schuh, David N. · Inventors: Schuh, David N.

CIPO record

Overview

Drawings and full text

Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

A relatively simple device for measuring such variables as piston wrist pin and connecting rod big end clearances in internal combustion engines includes a cylindrical casing with a threaded front end for mounting in a spark plug hole; an elongated arcuate wire probe slidable in a sleeve on such front end for engaging the top end of a piston; a plunger slidably mounted in the casing and extending beyond the other end of the casing to a micrometer for measuring piston movement; and air and oil lines extending through the casing to such front end for introducing a vacuum, air or oil to the cylinder for various measuring procedures.

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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 August 27, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 27, 2008.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJanuary 25, 1988
GrantedAugust 27, 1991
Term endedAugust 27, 2008
Patent numberCA 1287971 C
Classification (IPC)G01B5/14

Timeline

Timeline From CIPO dates

1989199119931995199719992001200320052007Application filedJan 25, 1988Patent grantedAug 27, 1991Term endedAug 27, 2008

Sources & verification

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.