Electricity: measuring and testing – Determining nonelectric properties by measuring electric... – Particle counting
Patent
1983-07-11
1985-03-05
Goldberg, Gerald
Electricity: measuring and testing
Determining nonelectric properties by measuring electric...
Particle counting
G01N 2700
Patent
active
045033854
ABSTRACT:
An apparatus for analyzing particles, adapted to operate continuously even in the absence of particles contained in a sample medium, includes a sensing region and a particle analyzer associated therewith. A fluid flow path, preferably air flow, causes a sample medium with particles therein to flow through the sensing region. Another fluid flow path ensheathes the sample medium with a flowing sheath fluid for hydrodynamically focusing the particles as they pass through the sensing region. The sheath fluid is adapted to flow at a first flow rate compatible with the flow rate of flowing particles. When the apparatus is operating in the absence of a sample medium, the sheath fluid is controlled to flow at a second flow rate, slower than the first flow rate, for collection thereof.
REFERENCES:
patent: Re28558 (1975-09-01), Hogg
patent: 3746976 (1973-07-01), Hogg
patent: 4070617 (1978-01-01), Kachel et al.
patent: 4110604 (1978-08-01), Haynes et al.
patent: 4165484 (1979-08-01), Haynes
patent: 4240029 (1980-12-01), Haynes
patent: 4434398 (1984-02-01), Berg et al.
Introducing the Ultra-Flo 100 Whole Blood Platelet Counter Clay Adams Lab Instr. Brochure Feb. 1979.
Becton Dickinson and Company
Goldberg Gerald
Rodrick Richard J.
Roskos Joseph W.
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