Appeal No. 97-1595
Application No. 08/209,786
(40) in which there are a plurality of test tube holding
receptors (50). The material to be acted upon is placed in a
test tube, which is installed in one of the cavities. The
test tube is closed by a closure (16), through which extends a
gas inlet (18) and an outlet (20). In operation, pressurized
gas is introduced through the inlet in a manner which
establishes a helical pattern (Figure 1). The motion of the
gas induces the removal of the liquid to be evaporated from
the test tube through the outlet.
Friswell fails to disclose or teach a source of vacuum to
induce the flow of gas to be evaporated, a chamber in which
are a plurality of positions for receiving sample vials, a
cover for the chamber, a plurality of apertures in the cover
in alignment with the positions for receiving the vials, and
an air channeling device in each of the apertures.
Bowser discloses a multiple tube evaporator. It
comprises a cover having an aperture for each of a plurality
of test tube receiving stations, which are supported in a
framework. There is no chamber in which multiple tubes are
received. Each test tube is pressed into a conical upper seat
(35), which effects a “semi-closure” of the open top of the
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