Liquid purification or separation – Flow – fluid pressure or material level – responsive – Check valve
Patent
1982-06-03
1984-08-07
Castel, Benoit
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Check valve
210359, 210516, 210927, 210DIG24, B01D 2126, B01D 3300
Patent
active
044642547
ABSTRACT:
In a serum separator, a sampling tube fits inside of a test tube. The sampling tube is provided with an elastomeric piston head at the lower end thereof having an annular lip to engage and form a seal with the inner sidewalls of the test tube. The upper side of the lip is provided with irregularities to break the seal between the lip and the test tube wall upon removal of the sampling tube from the test tube. A porous plastic filter body is mounted in a cavity in the piston head. The piston head defines a one-way valve in the form of a ball chamber containing a ball check. When the sampling tube is pushed into the test tube with a blood sample in the test tube, serum will pass through the filter body and valve into the interior of the sampling tube. The valve is constructed so that the serum cannot squirt toward the top of the sampling tube. When the sampling tube has been inserted, the valve will close. When the sampling tube is withdrawn, the reduced pressure in the bottom of the test tube will cause the ball to wedge in sealing engagement in the closed position to retain the serum sample in the sampling tube and isolate it from the residue in the bottom of the test tube.
REFERENCES:
patent: 3661265 (1972-05-01), Greenspan
patent: 3849072 (1974-11-01), Ayres
patent: 3935113 (1976-01-01), Ayres
patent: 3969250 (1976-07-01), Farr
patent: 4189385 (1980-02-01), Greenspan
patent: 4202769 (1980-05-01), Greenspan
Dojki Kassim H. V. M.
Haldopolouis Iaokim
Castel Benoit
Jones W. Gary
Porex Technologies Corp.
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