Patent Yard Sign in
Expired Canadian patentCanada

Electric call and call answering apparatus

CA 58136 A · Owner: Donaldson, Fred Hamilton · Inventors: Donaldson, Fred Hamilton; Williams, Charles Nelson; Owen, Edward Hopson

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 November 15, 1897. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 15, 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.
FiledJune 3, 1897
GrantedNovember 15, 1897
Term endedNovember 15, 1914
Patent numberCA 58136 A
Classification (IPC)—

Timeline

Timeline From CIPO dates

189819001902190419061908191019121914Application filedJune 3, 1897Patent grantedNov 15, 1897Term endedNov 15, 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.