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Expired Canadian patentCanada

Folded extended window field effect transistor

CA 1284235 C · Owner: Lu, Chih-Yuan · Inventors: Lu, Chih-Yuan; Yaney, David Stanley; Lee, Kuo-Hua

CIPO record

Overview

Drawings and full text

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

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Abstract From the Canadian patent

A gate electrode having an insulating top layer as well as insulating sidewall spacers permits the source and drain regions to be electrically contacted through windows directly above the source and drain regions formed in a window pad layer. The window pad layer may also be used as a sublevel interconnect.

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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 May 14, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 14, 2008.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 29, 1988
GrantedMay 14, 1991
Term endedMay 14, 2008
Patent numberCA 1284235 C
Classification (IPC)H01L21/28 +2 more

Timeline

Timeline From CIPO dates

1989199119931995199719992001200320052007Application filedNov 29, 1988Patent grantedMay 14, 1991Term endedMay 14, 2008

Sources & verification

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