Patent Yard Sign in
Expired Canadian patentCanada

Electrical recording apparatus

CA 67149 A · Owner: Callendar, Hugh L. · Inventors: Callendar, Hugh L.

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 April 25, 1900. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 25, 1917.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 3, 1898
GrantedApril 25, 1900
Term endedApril 25, 1917
Patent numberCA 67149 A
Classification (IPC)—

Timeline

Timeline From CIPO dates

1899190119031905190719091911191319151917Application filedAug 3, 1898Patent grantedApril 25, 1900Term endedApril 25, 1917

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.