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Expired Canadian patentCanada

Thermistor intended primarily for temperature measurement and procedure for manufacture of a thermistor

CA 1316272 C · Owner: Hallje, Per · Inventors: Silverberg, Per; Hallje, Per; Agnvall, Clas-Goran

CIPO record

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Abstract From the Canadian patent

The invention relates to a thermistor primarily intended for, temperature measurement. The thermistor comprises at least two thermistor plates (14-17) on a carrier (10) adjacent to each, other and connected in series. The plates are separated from each other by a preferably elongated gap (18) and the upper surfaces of said plates are largely covered by upper electrode surfaces (24-26). The thermistor plates (14-17) are arranged within a limited area of the carrier (10) so that the maximum aggregate area of the thermistor plates (14-17) is constant whereas the size of each individual thermistor surface is variable by displacement of the position of the gap(s) (18) within the said limited …

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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 April 13, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 13, 2010.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 29, 1989
GrantedApril 13, 1993
Term endedApril 13, 2010
Patent numberCA 1316272 C
Classification (IPC)H01C7/00

Timeline

Timeline From CIPO dates

1990199319961999200220052008Application filedSep 29, 1989Patent grantedApril 13, 1993Term endedApril 13, 2010

Sources & verification

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