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Expired Canadian patentCanada

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CA 181275 A · Owner: Riggs, Alfred Leander · Inventors: Riggs, Alfred Leander

CIPO record

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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 December 25, 1917. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 25, 1934.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledFebruary 19, 1917
GrantedDecember 25, 1917
Term endedDecember 25, 1934
Patent numberCA 181275 A
Classification (IPC)—

Timeline

Timeline From CIPO dates

191819201922192419261928193019321934Application filedFeb 19, 1917Patent grantedDec 25, 1917Term endedDec 25, 1934

Sources & verification

Official CIPO records

Canadian Patents DatabaseClaims, description, documents and status.CIPO

Cross-check elsewhere

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.