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Expired Canadian patentCanada

Method of producing ii-v compound semiconductors

CA 1250209 A · Owner: Shinanokenshi Co. Ltd. · Inventors: Suda, Toshikazu

CIPO record

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

A method of producing II-V compound semiconductors with greatly reduced intrinsic defect levels comprises the step of causing atoms, radicals or ions, of at least one member selected from the group consisting of hydrogen and the halogens to be injected into and diffused through II-V compound semiconductors during or after the production thereof.

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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 February 21, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 21, 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.
FiledMarch 8, 1985
GrantedFebruary 21, 1989
Term endedFebruary 21, 2006
Patent numberCA 1250209 A
Classification (IPC)C30B23/02 +2 more

Timeline

Timeline From CIPO dates

1986198919921995199820012004Application filedMarch 8, 1985Patent grantedFeb 21, 1989Term endedFeb 21, 2006

Sources & verification

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