Appeal No. 96-1802 Page 9
Application No. 08/060,922
normally receiving gas from the filter element; a gas outlet
downstream of the measured gas line; a heating coil around the
filter element for heating the filter element; and a heater
about the measured gas line for heating the measured gas line.
The heating coil around the filter element and the heater
about the measured gas line are provided as separate units,
each with its own heating system.
Hölzl discloses an apparatus for extracting hot gas
samples from a reaction vessel. As shown in Figures 1-2, the
apparatus includes a gas inlet (Hölzl's extraction probe 1
having inner tube 4); an elongate filter element downstream of
the gas inlet and in fluid communication with the gas inlet
for normally receiving gas from the gas inlet (Hölzl's filter
2 having a filter plug 6 and a filter cup/housing 3); a
measured gas line downstream of the filter element and in
fluid communication with the filter element for normally
receiving gas from the filter element (Hölzl's gas delivery
line 18); and a gas outlet downstream of the measured gas line
(the outlet of Hölzl's gas delivery line 18). Hölzl teaches
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