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Expired Canadian patentCanada

System for making a thermo-active device temperature dependent

CA 1231163 A · Owner: Thomson-Csf · Inventors: Hehlen, Robert; Marcenac, Philippe

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

The invention provides a system for making a device temperature dependent whose operation is dependent on the local heating applied to a thermo-active material layer. The invention uses the heating electrodes of the device as temperature sensors, the information detected ho these sensors being stored in a memory and used as bases for establishing the temperature dependence.

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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 5, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 5, 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.
FiledDecember 19, 1983
GrantedJanuary 5, 1988
Term endedJanuary 5, 2005
Patent numberCA 1231163 A
Classification (IPC)G02F1/13 +2 more

Timeline

Timeline From CIPO dates

19841987199019931996199920022005Application filedDec 19, 1983Patent grantedJan 5, 1988Term endedJan 5, 2005

Sources & verification

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