The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 20, 1990
Filed:
Jan. 14, 1988
Yuji Oshikubo, Chiba, JP;
Nichiryo Co., Ltd., Tokyo, JP;
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.