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Expired Canadian patentCanada

Gas-sensitive composite material comprising metal and dielectric and process for producing same

CA 1256755 A · Owner: Toa Nenryo Kogyo K.K. · Inventors: Komiyama, Hiroshi

CIPO record

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Abstract From the Canadian patent

A gas-sensitive composite material comprises a porous dielectric having micropores and a thin film consisting of ultrafine metal particles dispersed in and supported by, at least the porous surface layers of the dielectric. The gas-sensitive composite material is produced by a method comprising the steps of: forming a thin film of conductive ultrafine metal particles on at least the porous surface layers of a porous dielectric and dispersing the thin film metal, in a size similar to the pore opening continuously or partly discontinuously in the porous layers whereby a three-dimensional composite material is obtained.

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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 July 4, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 4, 2006.
  • 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 27, 1985
GrantedJuly 4, 1989
Term endedJuly 4, 2006
Patent numberCA 1256755 A
Classification (IPC)H01L49/00 +1 more

Timeline

Timeline From CIPO dates

1986198919921995199820012004Application filedSep 27, 1985Patent grantedJuly 4, 1989Term endedJuly 4, 2006

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