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Expired Canadian patentCanada

Waste energy source utilization circuit and method

CA 1068337 A · Owner: Wilkerson, Alan W. · Inventors: Wilkerson, Alan W.

CIPO record

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

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Abstract From the Canadian patent

Abstract of the Disclosure, A switching circuit typically a thyristor bridge, is connected to a source of waste energy. The source provides d.c. power either directly or through conversion. The switching means is also connected to an a.c. load and across a.c. power mains energizing the load. The switching circuit is operable to periodically connect the waste energy source to the a.c. load in a power supplying manner. The a.c. mains impart suitable voltage and frequency characteristics to the electrical power so supplied. In the event the supplied power exceeds the power required by the a.c. load, the difference is taken by the a.c. power mains. -0-

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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 18, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 18, 1996.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Filed—
GrantedDecember 18, 1979
Term endedDecember 18, 1996
Patent numberCA 1068337 A
Classification (IPC)H02J3/04 +2 more

Timeline

Timeline From CIPO dates

198019821984198619881990199219941996Patent grantedDec 18, 1979Term endedDec 18, 1996

Sources & verification

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