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Expired Canadian patentCanada

Self regulating induction heater

CA 1311809 C · Owner: Ladd, Kevin · Inventors: Carter, Philip S. Jr.; Ladd, Kevin; Cowell, Mark J.

CIPO record

Overview

Drawings and full text

Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

A self regulating heater comprises a nonconductive, magnetic core having a coil wound about it and providing pole pieces extending into contact or very near contact with a surrounding ferromagnetic member which in turn may be surrounded by and in intimate contact with a non-magnetic low resistance member; the magnetic member having an effective Curie temperature at the temperature to be maintained.

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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 December 22, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 22, 2009.
  • 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 8, 1988
GrantedDecember 22, 1992
Term endedDecember 22, 2009
Patent numberCA 1311809 C
Classification (IPC)B23K3/02 +2 more

Timeline

Timeline From CIPO dates

1989199219951998200120042007Application filedJune 8, 1988Patent grantedDec 22, 1992Term endedDec 22, 2009

Sources & verification

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