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Expired Canadian patentCanada

Vacuum arc discharge device with tapered rod electrodes

CA 1104635 A · Owner: General Electric Company · Inventors: Rich, Joseph A.; Westendorp, Willem F.

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Abstract From the Canadian patent

In a vacuum arc discharge device of the rod array type improved arc diffuseness and enhanced ability to hold off voltage during the recovery period are obtained by tapering the rods, with the maximum diameter occurring near the free ends. A higher threshold current for rod anode spot formation and melting also results.

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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.

Why it's free to use

  • Granted July 7, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 7, 1998.
  • 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 26, 1978
GrantedJuly 7, 1981
Term endedJuly 7, 1998
Patent numberCA 1104635 A
Classification (IPC)H01J19/00 +1 more

Sources & verification

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