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Class 377/11 - Including particle size determination variations


Subclass of Class 377 - Electrical pulse counters, pulse dividers, or shift registers: circuits and systems
Definition: Subject matter including means for determining particle
No. of patents: 71
Last issue date: 01/29/2008


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NumberTitleIssue Date
4596464Screening method for red cell abnormality
Red cell samples are passed through a zone of focused illumination, and a scatter vs. time pulse is obtained for each. Each pulse is analyzed for pulse width, pulse area, and pulse shape. These parameters are respectively collected, and three coefficients...
06/24/1986
4580093Method and apparatus for correcting coincidence errors during counting of two types of particles
During a predetermined measuring time there are generated electrical pulses in a detector arrangement, each of these electrical pulses corresponding to a respective particle which is to be counted. The pulse amplitude of the electrical pulses corresponds ...
04/01/1986
4491926Particle size distribution analyzer
A particle size distribution analyzer includes a detector adapted to detect particles by electrical or optical differences from a medium containing the particles in dispersion and generate signals proportionally to the sizes of the detected particles, a t...
01/01/1985
4488248Particle size distribution analyzer
A particle size distribution analyzer comprising a particle detector adapted to produce signals in response to the sizes of particles by electrical or optical differences between a liquid and the particles dispersed therein, a plurality of comparators con...
12/11/1984
4485442Cumulative exposure metering system
An electron dosimeter system which measures the length of time that an individual, or object, is exposed to discrete strength levels of a stimulating medium. The dosimeter device is comprised of a sensing device with associated electronics, a converter an...
11/27/1984
4477917Digital disdrometer
A plurality of thin, conductive wires are stretched across the open center of a frame through which the liquid drops to be measured will fall. Adjacent wires are maintained at a potential difference with respect to each other so that when the wires are mo...
10/16/1984
4453226Method and apparatus for particle size determination in a host material
A method and apparatus for determining the size distribution of certain particles, of a particular composition, such as iron sulfide (pyrites), in a sample of host material, such as coal. Data representative of the amount of at least one predetermined ele...
06/05/1984
4447883Coincidence-error correcting apparatus and method
New and improved method and apparatus for the correction of coincident errors attendant the automated detection and counting of mixed particles having detectable characteristics of different levels in particle counting applications wherein the detection o...
05/08/1984
4438390Tandem sensing zones for improved signal-to-noise ratio in particle analyzer
A tandem arrangement of sensing zones is established by alternately arranged electrodes and dielectric plates, each sensing zone has a particle sensing aperture, through which microscopic particles in an electrolyte suspension pass and electric current fl...
03/20/1984
4420720Field focused particle sensing zone
A particle analyzer wherein a flow of liquid suspension, having individually entrained particles, flows along a predetermined path; a center pair of electrodes are positioned on opposed sides of the predetermined path: the center electrodes are energized ...
12/13/1983
4375615Apparatus for counting particles in a liquid suspension
Apparatus for counting platelets and red blood cells in a whole blood sample includes an aperture type transducer. Alarm techniques are provided for indicating defects in the counting procedure due to excessive noise or red cell fragments, small (microcyt...
03/01/1983
4347438Light transceiver device
An improved light transceiver device for use in alarm or counting systems. The transceiver is housed in a light tight housing and includes an adjustable mirror offset from the active element of the transceiver. The mirror directs light through an aperture...
08/31/1982
4338564Hematology control composition and methods for its use
A control blood platelet preparation containing a population of platelets of known count range, electronic volume and electronic volume size distribution is used to check the threshold setting calibrations of an electronic particle counter. The control pr...
07/06/1982
4314346Auxiliary apparatus for a particle analyser
An auxiliary apparatus for a particle analyzer for measuring the particle count within particle size intervals bounded by shiftable or displaceable thresholds. Infeed lines conduct the signals generated in a feeler to comparators. Other infeed lines condu...
02/02/1982
4312180Detecting particles
Apparatus 30 for detecting the presence of more than a negligible concentration of dust or other particles in a moving stream of air or other gas (31), comprising first (1) and second (2) electrically conductive members spaced apart in a first region (A')...
01/26/1982
4307339Particle counter
A particle counter for determining the size and count of particulate substances suspended in an electrolytic solution includes a tube having an inlet hole for the passage of the solution therethrough, a pump connected to the tube for drawing the solution ...
12/22/1981
4307376Pattern recognition system for generating hematology profile
A system is disclosed for generating a maturity index for blood cells which may be used in a hematology profile to show the health of a patient. The system includes a scanning system for scanning a cell, pattern recognition means connected to the scanning...
12/22/1981
4302754Wear particle disintegrator monitor
An electromagnetic system is provided to monitor the activity of a ferrous debris detector of the type which uses electric discharges to automatically disintegrate magnetically concentrated accumulations of micron sized wear particles in hydraulic systems...
11/24/1981
4298836Particle shape determination
Apparatus and method wherein particles in a liquid stream are hydrodynamically focused to pass through an impedance sensing orifice, a low frequency current source provides a current through the orifice to produce a signal representative of the particle's...
11/03/1981
4280625Shade determination
The invention relates to the measurement of the shade of a particle. The particle is illuminated with light of variable intensity and viewed against a background level of illumination. A measurement is made of the ratio of time for which the intensity of ...
07/28/1981
4255656Apparatus for charged particle spectroscopy
Charged-particle spectroscopy apparatus for the chemical analysis of a sample in which an apertured plate receives charged particles emitted from the sample and transmits them to an analyzer for analyzing the energies of the particles, the aperture of the...
03/10/1981
4251768Coincidence correction of hematocrit in a hematology measurement apparatus
In a hematology measurement apparatus, a hematocrit value is generated by incrementing a value in accumulation means in accordance with measured sizes of red blood cells. The hematocrit value is corrected for coincidence by incrementing the value addition...
02/17/1981
4240107Apparatus and method for pattern information processing
A pattern information processing method is disclosed in which a video signal of an object from a television camera is divided at a plurality of different threshold levels, a clock pulse is gated with the divided video signals, the number of gated clock pu...
12/16/1980
4110604Particle density measuring system
A method and apparatus are provided for determining the count per unit volume, that is, the density of particles such as platelets in diluted whole blood. The invention involves use of known information, namely, the count per unit volume of other (referen...
08/29/1978
4110043Apparatus for counting and classifying particles
Apparatus for counting and classifying particles and including a laser for producing a laser beam, a flow nozzle for hydrodynamically focussing a stream of such particles and directing the focussed stream to intersect the laser beam, a focussing system ca...
08/29/1978
4097845Method of and an apparatus for automatic classification of red blood cells
A method and apparatus for automatically classifying abnormal and normal red blood cells is disclosed. The abnormal cells may be differentiated into mutually exclusive subpopulations. The individual hemoglobin characteristic for each red blood cell is mea...
06/27/1978
3982183Particle sizing apparatus
Apparatus for obtaining automatically the distribution of volume or mass of particles suspended in a sample. The sample is analyzed in successive sequences or sections each representing a magnitude of given particles. A counter is provided for counting th...
09/21/1976
3944797Method and apparatus for determining the correct percentiles of the size distribution of a particulate system
An apparatus for determining the correct particle sizes at predetermined percentiles of the size distribution of a particulate system having a known size distribution characteristic such as for example a normal or log-normal size distribution, wherein a p...
03/16/1976
3936666Apparatus for measuring a particle size dividing one of the mass or particle number of a particulate system into predetermined fractions
A particle study apparatus which in response to passage of particles in suspension through a sensing device produces electrical pulses which are proportional in amplitude to the size of the respective particles. The apparatus includes a system for ascerta...
02/03/1976
3935562Pattern recognition method and apparatus
Method and apparatus for pattern recognition, and especially biological sample analysis, by optical scanning of a pattern to derive a waveform which is processed to provide data values defining the scanned pattern in terms of functions of the frequency of...
01/27/1976
3932839Pattern analysis apparatus and method
Method and apparatus for providing data values characteristic of objects having many different levels of light remissivity, or shades of grey, includes scanning an object to derive density and density gradient signals, accumulating signals falling within ...
01/13/1976
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