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Expired Canadian patentCanada

Method of treating sea-weed

CA 61251 A · Owner: Johansgade, Karl · Inventors: Krefting, Axel; Johansgade, Karl

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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 23, 1898. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 23, 1915.
  • 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 18, 1896
GrantedSeptember 23, 1898
Term endedSeptember 23, 1915
Patent numberCA 61251 A
Classification (IPC)—

Timeline

Timeline From CIPO dates

1897189919011903190519071909191119131915Application filedNov 18, 1896Patent grantedSep 23, 1898Term endedSep 23, 1915

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.