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Expired Canadian patentCanada

Grain car door

CA 175447 A · Owner: Southwick, Ira M. · Inventors: Blaisdell, Sidney F.; Southwick, Ira M.

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.

Google PatentsCIPO record

Why it's free to use

  • Granted March 6, 1917. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 6, 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.
FiledJuly 17, 1916
GrantedMarch 6, 1917
Term endedMarch 6, 1934
Patent numberCA 175447 A
Classification (IPC)—

Timeline

Timeline From CIPO dates

191719191921192319251927192919311933Application filedJuly 17, 1916Patent grantedMarch 6, 1917Term endedMarch 6, 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.