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Expired Canadian patentCanada

Apparatus for dry processing a semiconductor wafer

CA 1286794 C · Owner: Palmer, David W. · Inventors: Palmer, David W.

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

Abstract of the Disclosure, A method and apparatus of dry processing a semiconductor wafer including processes of vacuum baking and dry silylation provides a gaseous atmosphere of pressure up to 760 Torr against the surface of the wafer, one or more of the constituents of the gas being obtained from a liquid fluid source of the constituent including a metering device that controls flow of the liquid fluid from a remote reservoir and feeds it to a vaporizer that converts the fluid to a vapor gas at pressure up to 760 Torr and feeds the vapor gas at that pressure into a wafer processing chamber where the particular dry process involving the vapor gas is carried out on the wafer surface. In a …

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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 23, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 23, 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.
FiledMarch 14, 1988
GrantedJuly 23, 1991
Term endedJuly 23, 2008
Patent numberCA 1286794 C
Classification (IPC)H01L21/00 +1 more

Timeline

Timeline From CIPO dates

1989199119931995199719992001200320052007Application filedMarch 14, 1988Patent grantedJuly 23, 1991Term endedJuly 23, 2008

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