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Expired Canadian patentCanada

Method of and apparatus for efficient high voltage generation by resonant flyback

CA 1208284 A · Owner: Keltron Corporation · Inventors: Santelmann, William F. Jr.

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Abstract From the Canadian patent

Abstract of Disclosure This disclosure is concerned with adapting very high-voltage, low-current, high impedance power source circuits, such as CRT anode supplies and the like, to employ the efficiency over wide input voltage ranges and other advantages, including small size, of switching-mode operation through combining variable frequency (or period) output control circuitry with resonant high-voltage transformers wherein the transformer resonant frequency is rendered comparable to the desired range of conversion frequencies; and in which resonant flyback circuit operation drives a voltage multiplier such as to accommodate the resonance caused by the stray capacitance shunting its storage …

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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 22, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 22, 2003.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 16, 1983
GrantedJuly 22, 1986
Term endedJuly 22, 2003
Patent numberCA 1208284 A
Classification (IPC)H04N3/18 +1 more

Timeline

Timeline From CIPO dates

1984198619881990199219941996199820002002Application filedDec 16, 1983Patent grantedJuly 22, 1986Term endedJuly 22, 2003

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