Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition
Patent
1996-03-05
1998-12-15
Pyon, Harold Y.
Chemical apparatus and process disinfecting, deodorizing, preser
Control element responsive to a sensed operating condition
7386413, 7386416, 7386418, 422103, G01N 114, B01L 302
Patent
active
058492488
ABSTRACT:
A volume adjustable pipette for aspirating and dispensing precise volumes of liquid comprising an elongated hollow hand-holdable housing supporting a plunger for turning and for axial movement within the housing the pipette including (i) an upper stop which is axially adjustable within the housing in response to a turning of the plunger to adjust the volume of liquid which may be drawn into a tip secured to a lower end of the housing upon upward axial movement of the plunger to the upper stop and (ii) a manually actuated lock mechanism for locking the plunger against rotation to set the volume adjustment for the pipette and comprising a hand-turnable knob for actuating and releasing the lock mechanism by virtue of two thumb and/or finger engageable wings extending outwardly from diametrically opposite sides of the hand-turnable knob a gripping member for fixedly securing the plunger against turning and being actuated by a turning of the hand-turnable knob to force a cam surface of the knob against a cam surface of the gripping member.
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patent: 5320810 (1994-06-01), Al-Mahareeq et al.
patent: 5330721 (1994-07-01), Tervamaki
Meads Robert R.
Pyon Harold Y.
Rainin Instrument Co. Inc.
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