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Expired Canadian patentCanada

Electronic inductor

CA 1305224 C · Owner: Spires, Dewayne Alan · Inventors: Spires, Dewayne Alan

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

Abstract, To produce a high current carring inductor with a high inductance value in spacenormally too small a transformer is chosen which meets space requirements and has a primary winding of sufficient current capacity but too little inductance. A, bidirectional current source drives the secondary winding under control of a feedback circuit in response to sensed primary winding current to effectively multiply the primary winding inductance.

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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 14, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 14, 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.
FiledJuly 6, 1989
GrantedJuly 14, 1992
Term endedJuly 14, 2009
Patent numberCA 1305224 C
Classification (IPC)H03H11/48

Timeline

Timeline From CIPO dates

1990199219941996199820002002200420062008Application filedJuly 6, 1989Patent grantedJuly 14, 1992Term endedJuly 14, 2009

Sources & verification

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