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Expired Canadian patentCanada

Method of and apparatus for testing eyes

CA 67074 A · Owner: Burpee, Wilfred Ernest · Inventors: Burpee, Wilfred Ernest; Brown, George Henry

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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 April 20, 1900. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 20, 1917.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 7, 1899
GrantedApril 20, 1900
Term endedApril 20, 1917
Patent numberCA 67074 A
Classification (IPC)—

Timeline

Timeline From CIPO dates

190019021904190619081910191219141916Application filedJune 7, 1899Patent grantedApril 20, 1900Term endedApril 20, 1917

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.