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Expired Canadian patentCanada

Rail fastening means

CA 1235104 A · Owner: Omark Australia Ltd. · Inventors: Clark, Jack; Geddes, Norman K.

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 sleeper having two pairs of protuberances upstanding from its upper portion, the protuberances of each pair defining between them a rail seat, apertures in the upper wall of the sleeper which extend from the protuberances for a short distance away from the rail seat four U-shaped, clips engaging each sleeper each U-shaped clip having an, upper toe which bears downwardly on the upper portion of the rail, a heel engaging the upper surface of the sleeper adjacent the relevant aperture, and a lower toe extending through an aperture in the rail and bearing upwardly against the undersurface of a respective protuberance.

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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 April 12, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 12, 2005.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 20, 1982
GrantedApril 12, 1988
Term endedApril 12, 2005
Patent numberCA 1235104 A
Classification (IPC)E01B9/34 +1 more

Timeline

Timeline From CIPO dates

19831986198919921995199820012004Application filedMay 20, 1982Patent grantedApril 12, 1988Term endedApril 12, 2005

Sources & verification

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