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:
Feb. 18, 2003
Filed:
Aug. 23, 2001
Akira Sakamoto, Osaka, JP;
Yasuhiro Hayashi, Osaka, JP;
Yoshihisa Yamashita, Osaka, JP;
Koji Yamamoto, Osaka, JP;
Mikunikikaj Co. Ltd., Osaka, JP;
Abstract
Amount of sub-micron particles in fluid such as ultra pure water classified each range of particle dimensions are detected by a simple apparatus in which a light beam from a coherent light source( ) is converged ( ) in such a manner that the light beam is focused in a stream ( ) of particle-containing fluid, the light passed through the stream and diffracted by the particles is received by a photo-detector ( ) which is positioned at an opposite side of the coherent light source with respect to the stream and substantially on an optical axis of the light beam, so that the number of particles in the stream is distinguished into plural ranges according to each frequencies of the signals emitted from the photo-detector and counting each numbers of the particles contained the ranges.