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Expired Canadian patentCanada

Ruling mechanism for slates

CA 56033 A · Owner: Herman Westenfeld, E.F. · Inventors: Herman Westenfeld, E.F.

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

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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.

Google PatentsCIPO record

Why it's free to use

  • Granted May 25, 1897. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 25, 1914.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 8, 1897
GrantedMay 25, 1897
Term endedMay 25, 1914
Patent numberCA 56033 A
Classification (IPC)—

Timeline

Timeline From CIPO dates

189819001902190419061908191019121914Application filedMarch 8, 1897Patent grantedMay 25, 1897Term endedMay 25, 1914

Sources & verification

Official CIPO records

Canadian Patents DatabaseClaims, description, documents and status.CIPO

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