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:
Aug. 28, 2001
Filed:
Mar. 22, 2000
Kensei Ebara, Tsukuba, JP;
Shoichiro Shin, Tsukuba, JP;
Abstract
An apparatus for measuring particle size distribution comprises an electric mobility classifying section (,) that comprises an outside electrode (,), an inside electrode (,) and an annular cylindrical hollow portion (,) defined by the outside and inside electrodes, a particle size measuring section (,) that is disposed under the electric mobility classifying section for measuring particle size distribution, and a guide frame (,) that allows the electric mobility classifying section and the annular cylindrical hollow section to communicate with each other. A sample gas containing charged particles under measurement is supplied from above into the annular cylindrical hollow section of the electric mobility classifying section to classify the particles according to their electric mobilities. The gas containing the classified particles is supplied into the particle size measuring section via the guide frame to directly obtain approximate particle sizes. The number of charges of the particles is obtained from the electric mobility and the approximate particle sizes. Precise particle sizes are determined from the number of charges and the electric mobilities.