Measuring and testing – Gas analysis
Reexamination Certificate
2006-04-11
2006-04-11
Larkin, Daniel S. (Department: 2856)
Measuring and testing
Gas analysis
C073S023310, C073S031050
Reexamination Certificate
active
07024916
ABSTRACT:
A vacuum heat treatment furnace comprising a furnace shell, a casing arranged in an inner side of the furnace shell, a heat insulating layer consisting of a thick plate-like alumina-silica series ceramic fiber blanket and a thin plate-like alumina series ceramic material arranged in an inside of the casing, and a heater arranged in a heating room surrounded by the heat insulating layer. A method of and apparatus for measuring a carbon concentration in an atmosphere in a treating room having a reduced pressure, wherein a carbon concentration measuring body is transferred from an external portion of a furnace shell of a heat treatment furnace into the treating room within the furnace shell, the carbon concentration measuring body is reacted with the atmosphere in the treating room for a predetermined time, the carbon concentration measuring body is gradually cooled for a predetermined time, and an amount of carbon in the carbon concentration measuring body is measured in atmospheric pressure at room temperature.
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JP 2001 012861 Abstract, Database WPI, Section Ch, Week 200123, XP-02211102, Derwent Publications Ltd.
Abukawa Fumitaka
Ebihara Hisashi
Juryozawa Hidetoshi
Takahashi Jun
Yokose Keiji
Dowa Mining Co. Ltd.
Larkin Daniel S.
Patterson Thuente Skaar & Christensen P.A.
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