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Expired Canadian patentCanada

Mechanically coupled electrical isolator including output stabilization

CA 1189156 A · Owner: Gte Atea N.V. · Inventors: Taylor, Michael G.C.

CIPO record

Overview

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

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Abstract From the Canadian patent

An electrical isolator utilizing the piezoelectric qualities of a polymer lamina having a first driving pair of electrodes, a second pickup pair of electrodes and a third sensing pair of electrodes. The third pair of electrodes is connected back to control a driving amplifier to cause it to maintain a constant output or driving level thereby compensating for changes in the characteristic of the polymer lamina.

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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 June 18, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 18, 2002.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 4, 1982
GrantedJune 18, 1985
Term endedJune 18, 2002
Patent numberCA 1189156 A
Classification (IPC)H01P1/36 +2 more

Timeline

Timeline From CIPO dates

1983198519871989199119931995199719992001Application filedNov 4, 1982Patent grantedJune 18, 1985Term endedJune 18, 2002

Sources & verification

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