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Expired Canadian patentCanada

Apparatus for recording and reproducing sounds and signals

CA 73385 A · Owner: Poulsen, Valdemar · Inventors: Poulsen, Valdemar

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 October 15, 1901. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 15, 1918.
  • 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 28, 1899
GrantedOctober 15, 1901
Term endedOctober 15, 1918
Patent numberCA 73385 A
Classification (IPC)—

Timeline

Timeline From CIPO dates

1900190219041906190819101912191419161918Application filedJune 28, 1899Patent grantedOct 15, 1901Term endedOct 15, 1918

Sources & verification

Official CIPO records

Canadian Patents DatabaseClaims, description, documents and status.CIPO

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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.