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Expired Canadian patentCanada

Bunsen burner

CA 92475 A · Owner: Wiederhold, Oscar · Inventors: Wiederhold, Oscar

CIPO record

Overview

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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 April 4, 1905. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 4, 1922.
  • 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 25, 1902
GrantedApril 4, 1905
Term endedApril 4, 1922
Patent numberCA 92475 A
Classification (IPC)—

Timeline

Timeline From CIPO dates

1903190519071909191119131915191719191921Application filedMarch 25, 1902Patent grantedApril 4, 1905Term endedApril 4, 1922

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.