Pumps – Expansible chamber type – Bellows-type chamber
Reexamination Certificate
2005-04-12
2005-04-12
Freay, Charles G. (Department: 3746)
Pumps
Expansible chamber type
Bellows-type chamber
C417S478000, C417S555200, C166S264000
Reexamination Certificate
active
06877965
ABSTRACT:
A mechanical bladder pump is provided for collecting fluid samples from a well. The pump includes an outer tubular member having a longitudinal bore, and an inner tubular member arranged within the bore of the outer tubular member. The inner and outer tubular members are connected at their lower ends to a compressible bladder, and are arranged for oscillating movement relative to each other to expand and compress the bladder. The lower end of the bladder is open to an inlet passage, and the upper end of the bladder is open to an outlet passage. First and second check valves are provided to control the flow of fluid through the bladder during operation of the pump. A return spring is used to store energy during a tension stroke of the inner tubular member and to release energy during a compression stroke thereof. The pump provides highly representative samples of groundwater.
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Puls, Robert W. et al., “Low-Flow (Minimal Drawdown) Ground-Water Sampling Procedures,”EPA Ground Water Issue, Apr. 1996.
Product Brochure for “Pneumatic Bladder Pump,” Geoprobe Systems, Salina, Kansas.
Christy Thomas M.
Cooper David
McCall Wesley
Freay Charles G.
Kejr Inc.
Thompson Jeffrey L.
Thompson & Thompson P.A.
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