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Expired Canadian patentCanada

Tester for terminal post resistance for an energy storage element connected in an electrical circuit

CA 1279697 C · Owner: Siemens Aktiengesellschaft · Inventors: Neugebauer, Dieter

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 resistance checker portion for terminal posts of an energy storage device includes a series branch formed of an ohmic resistor at a switch connected in parallel to the energy storage device through the terminal posts. Brief closing of the normally open switch causes a voltage jump in the series branch which is a direct measurement of the resistance of the terminal posts. An evaluator measures the voltage jump and calculates the contact resistance of the terminal posts therefrom.

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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 January 29, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 29, 2008.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 6, 1987
GrantedJanuary 29, 1991
Term endedJanuary 29, 2008
Patent numberCA 1279697 C
Classification (IPC)G01R27/20 +1 more

Timeline

Timeline From CIPO dates

1988199119941997200020032006Application filedApril 6, 1987Patent grantedJan 29, 1991Term endedJan 29, 2008

Sources & verification

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