Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition
Patent
1987-12-09
1989-10-31
Hill, Jr., Robert J.
Chemical apparatus and process disinfecting, deodorizing, preser
Control element responsive to a sensed operating condition
436180, 7386401, B01L 302
Patent
active
048775851
ABSTRACT:
A graduated pipette having a known total delivery volume, suitable for accurately dispensing both known large and known small volumes of a fluid, wherein the small volume is less than one fourth of the delivery volume of the pipette, the pipette comprising: an upper and a lower elongated tube joined together to form a single continuous unit, the upper tube having a different internal diameter from the lower tube, the upper tube having coarse indicia suitable for accurately dispensing the large volume, wherein the coarse indicia are labelled from zero ml to the volume of the upper tube, the lower tube having fine indicia suitable for accurately dispensing the small volume, wherein the fine indicia are labelled from zero ml to the volume of the lower tube, wherein the upper tube comprises a mouthpiece suitable for allowing fluid to be sucked up into the unit, and the lower tube comprises a constricted region suitable to allow accurate control of fluid flow from the unit, wherein the fluid is accurately dispensed from the unit only through the constricted region.
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Alexander Lyle Alfandary
Brandeis University
Hill Jr. Robert J.
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