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Expired Canadian patentCanada

Native growth of semiconductor oxide layers

CA 1084816 A · Owner: Western Electric Company, Incorporated · Inventors: Chang , Robert P.H.; Sinha, Ashok K.

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Abstract From the Canadian patent

Abstract of the Disclosure, An amorphous stoichiometric, native, semiconductor, oxide layer with a sharp interface between the oxids layer and the substrate, is grown by directing electrons toward a semiconductor substrate in the presence of oxygen. The source of electrons may be a simple filament. This invention may be implemented with standard plasma growth techniques by extracting the electrons from the plasma production region and directing them to the substrate - i -

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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 September 2, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 2, 1997.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 10, 1977
GrantedSeptember 2, 1980
Term endedSeptember 2, 1997
Patent numberCA 1084816 A
Classification (IPC)C30B33/00 +1 more

Timeline

Timeline From CIPO dates

1978198019821984198619881990199219941996Application filedMay 10, 1977Patent grantedSep 2, 1980Term endedSep 2, 1997

Sources & verification

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