Appeal No. 2004-1137
Application No. 09/734506
collection and removal of the fluid sample. As can be seen in
Figure 1 of the patent, the sample bottle (10) and conduit (32)
are housed within a vacuum jacketed Dewar (50), with the sample
bottle being submerged below the surface (53) of a liquid cryogen
(51) and the conduit extending therefrom to a manifold structure
(34) carried on the cover/flange (30) of the Dewar. In addition,
a cryogenic refrigerator member (70) is carried by the
cover/flange (30) and has a cold end (72) extending into the
interior of the Dewar and positioned above the surface (53) of
the liquid cryogen.
As indicated in column 3, lines 34, et seq., in use, for
sampling air, the sampler of Longsworth is assembled as shown
with a supply of liquid cryogen (e.g., liquid nitrogen)
introduced into the Dewar through the refrigerator port (31) to
cool sample bottle (10) to 77 degrees Kelvin (ºK.). After the
liquid nitrogen (51) and sample bottle are introduced into the
Dewar, the refrigerator member (70) is put in place and
activated. In addition, to effect a rapid cool-down from 77º K.
to less than 73º K., a small vacuum pump is connected to the
Dewar (at valve 94) so that the space above the surface (53) of
the liquid nitrogen can be rapidly evacuated. Longsworth notes
77
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