Electricity: measuring and testing – Determining nonelectric properties by measuring electric...
Patent
1981-09-08
1983-11-29
Tokar, Michael J.
Electricity: measuring and testing
Determining nonelectric properties by measuring electric...
377 12, G01N 2700
Patent
active
044183135
ABSTRACT:
A device and process for examining the size of particles suspended in a liquid, in particular for determining the MCV of red blood cells, having a measurement aperture traversed by the suspension and two electrodes arranged in the region of the measurement aperture and connected to evaluation circuitry, each of which electrodes producing one pulse per particle passing therethrough, the amplitude of which pulse is a measure of the volume of the particle. A differential discriminator for the pulse amplitudes and a further discriminator are connected in front of the evaluation circuitry wherein the further discriminator permits the passage of only pulses whose duration is less than the duration of a pulse coming from a single particle which has a maximum amplitude determined by the differential discriminator.
REFERENCES:
patent: 3502973 (1970-03-01), Coulter
patent: 3603875 (1971-09-01), Coulter
patent: 3793587 (1974-02-01), Thom
patent: 3882385 (1975-05-01), Coulter
patent: 3961249 (1976-06-01), Coulter
patent: 3970928 (1976-07-01), Kachel
patent: 4290001 (1981-09-01), Berg
Cserey Laszlo
Vimlati Pal
Zillich Pal
Katona Gabriel P.
Medicor Muvek
Tokar Michael J.
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