Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition
Patent
1991-04-08
1992-04-14
Kummert, Lynn M.
Chemical apparatus and process disinfecting, deodorizing, preser
Control element responsive to a sensed operating condition
7386413, 7386414, 7386416, 7386418, 141 25, 141 27, B01L 302
Patent
active
051046245
ABSTRACT:
A hand-held, manually operated pipetter having a variable volume controlled by a rotating spindle and adjusting screw that control the position of a stop which limits the upper end of the stroke of the pipetter piston. The lower end of the stroke is controlled by a movable stop urged to a first position by a blow-out spring which may be overcome with additional force applied to the pipetter piston when the lower stop is engaged. The pipetter also includes a stripper which surrounds the tip holder and which is actuated by a rod movable in the body of the pipetter along a path parallel to the path of the pipetter piston. The pipetter piston and the stripper rod are controlled by separate actuators which may readily be engaged by the thumb of the hand which holds the body of the device.
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Costar Corporation
Kummert Lynn M.
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