Patent Yard Sign in
Expired Canadian patentCanada

Gold dredging machine

CA 57747 A · Owner: Shahan, Wilfred A. · Inventors: Shahan, Wilfred A.

CIPO record

Overview

Drawings and full text

Its claims, description and drawings are in the Canadian Patents Database.

Open the CIPO record

Read the whole patent

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 October 9, 1897. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 9, 1914.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 15, 1897
GrantedOctober 9, 1897
Term endedOctober 9, 1914
Patent numberCA 57747 A
Classification (IPC)—

Timeline

Timeline From CIPO dates

189819001902190419061908191019121914Application filedMay 15, 1897Patent grantedOct 9, 1897Term endedOct 9, 1914

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.