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:
Oct. 27, 2009
Filed:
Sep. 08, 2006
Yaohui Zhang, Shenzhen, CN;
Cheng Zhang, Shenzhen, CN;
Liangqing LI, Shenzhen, CN;
Abstract
The present invention discloses a liquid volumetric device comprising a metering tube, a start sensor, an end sensor, a bath for storage of a sample to be metered, a vacuum chamber and a pump for pumping out air inside the vacuum chamber to form a negative pressure inside the vacuum chamber. The start sensor and the end sensor are provided respectively at the bottom and the top of the metering tube, the top of the metering tube is in communication respectively with the vacuum chamber and the outside atmosphere via pipelines, the bottom of the metering tube is in communication respectively with the bath and the vacuum chamber via pipelines, and control parts are provided in each of the pipelines for controlling connection/disconnection thereof. Thus, by forming a negative pressure inside the vacuum chamber, a sample in the bath may be pressed from down to up into the metering tube by means of a pressure difference between the atmosphere and the negative pressure, so as to complete the volume metering, whereby an occurrence of the side flow phenomenon can be completely eliminated.