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Expired Canadian patentCanada

Electron emitting cathode

CA 190772 A · Owner: Hocker, Carl D. · Inventors: Hocker, Carl D.

CIPO record

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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.

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Why it's free to use

  • Granted June 3, 1919. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 3, 1936.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJanuary 8, 1917
GrantedJune 3, 1919
Term endedJune 3, 1936
Patent numberCA 190772 A
Classification (IPC)—

Timeline

Timeline From CIPO dates

1918192019221924192619281930193219341936Application filedJan 8, 1917Patent grantedJune 3, 1919Term endedJune 3, 1936

Sources & verification

Official CIPO records

Canadian Patents DatabaseClaims, description, documents and status.CIPO

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.