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Expired Canadian patentCanada

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CA 58331 A · Owner: Prefontaine, Jean B.I. · Inventors: Prefontaine, Jean B.I.

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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 December 9, 1897. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 9, 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.
FiledNovember 12, 1897
GrantedDecember 9, 1897
Term endedDecember 9, 1914
Patent numberCA 58331 A
Classification (IPC)—

Timeline

Timeline From CIPO dates

189819001902190419061908191019121914Application filedNov 12, 1897Patent grantedDec 9, 1897Term endedDec 9, 1914

Sources & verification

Official CIPO records

Canadian Patents DatabaseClaims, description, documents and status.CIPO

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Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.com

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