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:
Jun. 08, 2010
Filed:
Apr. 04, 2008
Tsutomu Nakajima, Tokyo, JP;
Tsutomu Nakajima, Tokyo, JP;
Rion Co., Ltd., Tokyo, JP;
Abstract
A particle counting method is provided whereby a liquid sample is radiated by a laser light, scattered light produced by causing the laser light to hit a particle in the liquid sample is detected by a photoelectric conversion element, and a sample value which is the output of the photoelectric conversion element is sequentially compared to a threshold preset for each particle size range, thereby counting the number of particles for each particle size range, the method comprising: a timer start-up step for starting a timer of a predetermined time when the sample value becomes smaller than a threshold of a minimum particle size for the first time and for sequentially holding the maximum value of the sample value; and a timer extension step for restarting the timer to sequentially hold the maximum value of the sample value when the sample value at the time-out of the timer start-up step is larger than the threshold of the minimum particle size.