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Expired Canadian patentCanada

Gas furnace

CA 181702 A · Owner: Graham, William J. · Inventors: Graham, William J.

CIPO record

Overview

Drawings and full text

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 January 22, 1918. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 22, 1935.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledOctober 25, 1917
GrantedJanuary 22, 1918
Term endedJanuary 22, 1935
Patent numberCA 181702 A
Classification (IPC)—

Timeline

Timeline From CIPO dates

191819201922192419261928193019321934Application filedOct 25, 1917Patent grantedJan 22, 1918Term endedJan 22, 1935

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.