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Class Information
Number: 250/564
Name: Radiant energy > Photocells; circuits and apparatus > Photocell controlled circuit > With circuit for evaluating a fluent material
Description: Subject matter including a circuit responsive to a photocell having fluent material in its optical path, wherein the circuit provides an output indicative of the density, scattering properties, index of refraction or the like, of the fluent material.










Sub-classes under this class:

Class Number Class Name Patents
250/565 With comparison 74


Patents under this class:
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Patent Number Title Of Patent Date Issued
8701746 Optically detected liquid depth information in a climate control unit Apr. 22, 2014
8482733 Measurement of the absorption coefficient of light absorbing liquids and their use for quantitative imaging of surface topography Jul. 9, 2013
8049895 Instrument for measuring particle parameters Nov. 1, 2011
7763856 Producing time variation in emanating light Jul. 27, 2010
7652267 UV fluorometric sensor and method for using the same Jan. 26, 2010
7595497 Fuel contaminant light sensor Sep. 29, 2009
7230688 System and method for processing information in a pulse oximeter Jun. 12, 2007
7053783 Pathogen detector system and method May. 30, 2006
6552355 Optical detection of entrapped gas in a cooling system Apr. 22, 2003
6290912 Read head for luminometer Sep. 18, 2001
6271758 Light projection device for a photoelectric smoke sensor Aug. 7, 2001
6087947 Allergen detector system and method Jul. 11, 2000
6008729 Allergen detector system and method Dec. 28, 1999
5986555 Allergen detector system and method Nov. 16, 1999
5969622 Allergen detector system and method Oct. 19, 1999
5869972 Testing device using a thermochromic display and method of using same Feb. 9, 1999
5841534 Apparatus for determining the density, size or size distribution of particles Nov. 24, 1998
5831730 Method for monitoring particulates using beam-steered solid-state light source Nov. 3, 1998
5680108 Apparatus and method for monitoring a steeping beverage and for indicating when a desired beverage strength is attained Oct. 21, 1997
5670947 Light scattering smoke sensor Sep. 23, 1997
5646597 Allergen detector system and method Jul. 8, 1997
5619043 System for acquiring an image of a multi-phase fluid by measuring backscattered light Apr. 8, 1997
5461479 Method for controlling the laying of a silicone string, particularly between the crankcase and the sump of an internal combustion engine Oct. 24, 1995
5247187 Measuring instrument and measuring method for identifying properties of a specimen with matched dual source calibration Sep. 21, 1993
5245200 Apparatus and method for preventing blockage of a measuring head for effecting measurements of suspended substances Sep. 14, 1993
5179288 Apparatus and method for measuring a bodily constituent Jan. 12, 1993
5172004 Method and apparatus for measuring particles in a fluid Dec. 15, 1992
4976871 Method of monitoring flocculant effectiveness Dec. 11, 1990
4963744 Method and apparatus for providing accurate low noise demodulation Oct. 16, 1990
4831641 Method and apparatus for analyzing a visible object May. 16, 1989
4823015 Electrical interference free projected beam smoke detector Apr. 18, 1989
4793706 Process and equipment for the determination of grain size distribution of particles in suspension Dec. 27, 1988
4781460 System for measuring the size distribution of particles dispersed in a fluid Nov. 1, 1988
4752131 Laser-optical arrangement for measuring the degree of dispersion in flowing systems Jun. 21, 1988
4752690 Method and apparatus for detecting incongruities, such as air bubbles, in fluid material Jun. 21, 1988
4740080 Analog to digital converter for fluid analyzing apparatus Apr. 26, 1988
4707134 Fiber optic probe Nov. 17, 1987
4676641 System for measuring the size distribution of particles dispersed in a fluid Jun. 30, 1987
4647780 Apparatus for measuring smoke density Mar. 3, 1987
4647786 Photoelectric smoke detector and its application Mar. 3, 1987
4642471 Scattered radiation smoke detector Feb. 10, 1987
4607955 Stock consistency transmitter Aug. 26, 1986
4589774 Sperm densimeter May. 20, 1986
4522493 Partial injection apparatus Jun. 11, 1985
4488812 Photometric apparatus Dec. 18, 1984
4344429 Bubble detector with feedback circuit for improved sensitivity Aug. 17, 1982
4325910 Automated multiple-purpose chemical-analysis apparatus Apr. 20, 1982
4212287 Insolation integrator Jul. 15, 1980
4208583 Detection of analysis of particulate material in fluid streams Jun. 17, 1980
4176953 Method and apparatus for measuring the motility of sperm cells Dec. 4, 1979

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