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Expired Canadian patentCanada

Method for manufacturing a layer of amorphous silicon usable in an electronic device

CA 1097433 A · Owner: Thomson-Csf · Inventors: Kaplan, Daniel; Velasco, Gonzalo

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Abstract From the Canadian patent

Abstract of the Disclosure A method aiming at imparting to the amorphous silicon properties which are compatible with the possibility of modifying by doping or field effect the position of the Fermi level in the volume of the amorphous silicon a prime requi-, rement for the operation of semiconductor devices. The method comprises a first step of depositing a layer of amorphous silicon onto a substrate under conditions ensuring the purity of the deposit obtained, then a second step wherein the deposit is subjected to a heat treatment consisting in maintaining the deposit in the atmosphere of a plasma containing atomic hydrogen for saturating the existing broken chemical bonds responsible for …

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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 March 10, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 10, 1998.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 5, 1978
GrantedMarch 10, 1981
Term endedMarch 10, 1998
Patent numberCA 1097433 A
Classification (IPC)H01L29/04 +2 more

Timeline

Timeline From CIPO dates

1979198119831985198719891991199319951997Application filedJune 5, 1978Patent grantedMarch 10, 1981Term endedMarch 10, 1998

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