US Patent No: 4,830,494

Number of patents in Portfolio can not be more than 2000

Method and apparatus for measuring particles in a fluid

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Abstract

Disclosed is a method and apparatus for measuring particles in a fluid by irradiating the fluid containing the particle with a laser beam and analyzing the laser light scattered by the particle to determine the characteristics of the particle. An elliptical laser beam is projected into a particle detection area in which the particles to be measured are caused to flow. The laser light scattered by the particle is received for photoelectric conversion into a time-series photoelectric signal in a direction along which the particle flows. The photoelectric signal is subjected to a moving average process to determine a time width during which the signal exceeds a predetermined level to cause the change in intensity of the scattered light. This change is recognized as a change in intensity caused by the passage of the particle through the particle detection area when the time width falls within a certain range.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
KOWA COMPANY, LTD.AICHI428

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Akiyama, Kouichi Fujisawa, JP 9 89
Fujita, Akihiro Kanagawa, JP 78 539
Ishikawa, Muneharu Tsukuba, JP 12 432
Ito, Eiichi Kasugai, JP 78 413
Kawamura, Masunori Aichi, JP 15 169

Cited Art

Patent Info (Count) # Cites Year
 
DADE BEHRING INC. (1)
4,521,521 Particle reagent size distribution measurements for immunoassay 21 1983
 
LEEDS & NORTHRUP COMPANY (1)
4,265,538 Optical sample cell for analysis of particles in liquid suspension 28 1979
 
OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (1)
4,226,532 Device for granulometric analysis of particles in fluids 5 1978

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
PARTICLE MEASURING SYSTEMS, INC. (6)
5,282,151 Submicron diameter particle detection utilizing high density array 23 1991
8,154,724 Two-dimensional optical imaging methods and systems for particle detection 0 2008
7,916,293 Non-orthogonal particle detection systems and methods 4 2008
8,027,035 Non-orthogonal particle detection systems and methods 3 2011
8,174,697 Non-orthogonal particle detection systems and methods 0 2011
8,427,642 Two-dimensional optical imaging methods and systems for particle detection 0 2012
 
BIOVIGILANT SYSTEMS, INC. (4)
6,087,947 Allergen detector system and method 12 1996
5,969,622 Allergen detector system and method 6 1998
7,430,046 Pathogen and particle detector system and method 7 2005
7,738,099 Pathogen and particle detector system and method 10 2006
 
KOWA COMPANY, LTD. (4)
5,135,306 Particle measuring method and apparatus 7 1989
5,090,808 Particle measurement apparatus 16 1989
5,030,843 Apparatus for measuring particles in liquid having a laminar flow condition 6 1990
5,621,523 Method and apparatus for measuring particles in a fluid 25 1995
 
TRANSLUME, INC. (2)
7,679,742 Method, system and apparatus for monitoring variations in the size of particles present in a fluid 0 2007
7,830,509 Particle size variation monitoring in a fluid 0 2009
 
AZBIL BIOVIGILANT, INC. (1)
8,218,144 Pathogen and particle detector system and method 0 2008
 
BOARD OF TRUSTEES OF THE UNIVERSITY OF ARKANSAS (1)
5,296,910 Method and apparatus for particle analysis 24 1992
 
BRIGHTWELL TECHNOLOGIES INC. (1)
7,605,919 Method and apparatus for analyzing particles in a fluid 1 2007
 
CATERPILLAR INC. (1)
6,966,994 Contamination control for engines 1 2002
 
CLEMSON UNIVERSITY (1)
6,480,276 Enhanced photon-migration methods for particle sizing in concentrated suspensions 7 2000
 
HACH COMPANY (1)
7,538,874 Measurement of light from a predefined scatter angle from particulate matter in a media 0 2006
 
HORIBA, LTD. (1)
4,990,795 Particle counter with photointensity compensation 11 1989
 
INSITEC, INC. (1)
5,101,113 Ensemble scattering particle sizing system with axial spatial resolution 17 1989
 
MARTIN MARIETTA ENERGY SYSTEMS, INC. (1)
5,383,024 Optical wet steam monitor 14 1994
 
OTSUKA ELECTRONICS CO., LTD. (1)
5,015,094 Particle size measuring system 11 1989
 
PACIFIC SCIENTIFIC COMPANY (1)
4,917,496 Particle size measuring instrument with direct scattered light detection 17 1988
 
PANASONIC ELECTRIC WORKS CO., LTD. (1)
6,611,611 Particle sensor 3 2001
 
RENESAS ELECTRONICS CORPORATION (1)
7,006,682 Apparatus for monitoring particles and method of doing the same 2 2000
 
RION CO., LTD. (1)
7,733,487 Particle counting method 0 2008
 
ROBERT N. HAMBURGER (1)
7,053,783 Pathogen detector system and method 12 2002
 
THE RESEARCH FOUNDATION OF STATE UNIVERSITY OF NEW YORK (1)
5,627,642 Method and apparatus for submicroscopic particle sizing by measuring degree of coherence 7 1995
 
TOA MEDICAL ELECTRONICS CO., LTD. (1)
5,047,963 Particle analyzing apparatus and method for determining nuclear shift index 7 1989
 
WAGNER GROUP GMBH (1)
6,831,289 Detector for scattered light 2 2002
 
OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (2)
7,034,937 Flow meter 1 2003
8,447,115 Method and installation for imaging 0 2007