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Expired Canadian patentCanada

Screw driver

CA 191237 A · Owner: Langford, Edwin Lewis · Inventors: Langford, Edwin Lewis

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 July 1, 1919. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 1, 1936.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 17, 1918
GrantedJuly 1, 1919
Term endedJuly 1, 1936
Patent numberCA 191237 A
Classification (IPC)—

Timeline

Timeline From CIPO dates

191919211923192519271929193119331935Application filedDec 17, 1918Patent grantedJuly 1, 1919Term endedJuly 1, 1936

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.