Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition
Patent
1988-01-14
1990-03-20
Nucker, Christine M.
Chemical apparatus and process disinfecting, deodorizing, preser
Control element responsive to a sensed operating condition
7386413, 7386414, 7386418, G01N 114, B01L 302
Patent
active
049099914
ABSTRACT:
A variable pipette is disclosed which is so designed that its volumetric capacity for sucking and discharging a sample is variable. A first-stage stroke l.sub.1 for sucking and discharging a sample is defined between a first first-stage stop portion of a nut and a second first-stage stop portion of an actuating shaft, and this stroke l.sub.1 is set through the actuating shaft, a first stop portion of a threaded hollow shaft, the hollow shaft and the nut, not through any portion of the body of the pipette. Therefore, even if the temperature of the body is raised by the heat transmitted from the operator's hand as it grips the pipette and the body is thereby expanded axially, the above-described stroke l.sub.1 is independent of the expansion of the body and there is therefore hardly any error produced in the stroke l.sub.1. Accordingly, it is possible to improve the reproducibility of quantitative determination carried out with the pipette when a sample is sucked and discharged, and it is therefore possible to improve the reliability of the device.
REFERENCES:
patent: 3646817 (1972-03-01), Hinchman et al.
patent: 3918308 (1975-11-01), Reed
patent: 4054062 (1977-10-01), Branham
patent: 4283950 (1981-08-01), Tervamaki
patent: 4418580 (1983-12-01), Satchell et al.
patent: 4435989 (1984-03-01), Meyer et al.
patent: 4679446 (1987-07-01), Sheehan et al.
Kummert Lynn M.
Nichiryo Co., Ltd.
Nilles James E.
Nucker Christine M.
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