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Expired Canadian patentCanada

Switched power supply comprising a free-running flow transformer without control loop

CA 1236522 A · Owner: Siemens Aktiengesellschaft · Inventors: Stasch, Harald

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 switched power supply has a rectifier arrangement for generating a DC voltage from an input AC voltage. A converter arrangement thereof has a switching transistor and a transformer. The converter arrangement is designed as a free-running flow converter wherein the switching transistor is switched on in a current-free condition. A secondary side of the converter arrangement comprises a secondary switch controller which is synchronized by the transformer and which regulates an output DC voltage.

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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 May 10, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 10, 2005.
  • 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 28, 1985
GrantedMay 10, 1988
Term endedMay 10, 2005
Patent numberCA 1236522 A
Classification (IPC)H02M3/33 +1 more

Timeline

Timeline From CIPO dates

1986198819901992199419961998200020022004Application filedJune 28, 1985Patent grantedMay 10, 1988Term endedMay 10, 2005

Sources & verification

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