Appeal 2007-2807
Reexamination 90/006,511
Patent 5,156,811
5. There are five independent claims, 1, 8, 10, 29 and 37.
6. Claim 1 recites a pipette device, and reads as follows:
1. A pipette device, comprising:
a hollow tube open at opposite first and second ends
thereof;
a plug member of porous, hydrophobic material located
in the tube between said first and second ends and spaced a
predetermined distance from said second end to define a liquid
sample chamber of predetermined volume below said plug
member, at least a majority of pores of said porous material
containing separate particles of a hydrophilic material for
absorbing any liquid contacting said plug member, the particles
being smaller than the pore size to allow gas to flow through
said plug member, and comprising means for expanding and
blocking said pores when contacted by a liquid; and
the first end of the tube comprising means for attachment
to a suction device for drawing a predetermined volume of
liquid less than said liquid sample chamber volume in through
the second end of the tube to leave an air gap between the plug
member and liquid when a sample of liquid is drawn into the
tube.
7 Independent claim 8 reads as follows:
8. Liquid sampling apparatus, comprising:
a hollow tube open at opposite first and
second ends thereof;
a plug member of porous, hydrophobic
material located in the tube between said first and
second ends to define a liquid sample chamber of
predetermined volume between the plug member
and said second end of the tube, at least a majority
3
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