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Expired Canadian patentCanada

Concentration for ores

CA 77441 A · Owner: Haultain, Herbert Edward Terrick · Inventors: Haultain, Herbert Edward Terrick; Stovel, Hubert Roy

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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.

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Why it's free to use

  • Granted September 16, 1902. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 16, 1919.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 16, 1902
GrantedSeptember 16, 1902
Term endedSeptember 16, 1919
Patent numberCA 77441 A
Classification (IPC)—

Timeline

Timeline From CIPO dates

190319051907190919111913191519171919Application filedApril 16, 1902Patent grantedSep 16, 1902Term endedSep 16, 1919

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.