Method and apparatus for size measurement of particles of...

Details Method and apparatus for size measurement of particles of... Method and apparatus for size measurement of particles of...

2007-10-30

2007-10-30

McGinty, Douglas (Department: 1751)

Compositions

Electrically conductive or emissive compositions

C324S071400, C324S092000, C324S093000, C324S094000

Reexamination Certificate

active

11512843

ABSTRACT:
Improvements to the electrical sensing zone instrument are described that allow the good accuracy of this type of instrument to be applied to the measurement of the size of particles of carbon black. The improvements include a concentrated aqueous electrolyte containing KI or NaI, a surfactant soluble in the electrolyte capable of dispersing particles of carbon black, and an anode electrode that is made of silver at the surface touching the electrolyte. The silver anode electrode prevents the degradation of the electrolyte by light and electrolysis.

REFERENCES:
patent: 2656508 (1953-10-01), Coulter
patent: 3815024 (1974-06-01), Bean
patent: 4157498 (1979-06-01), Johnson
U.S. Appl. No. 11/329,829, Roos.
De Blois And Bean, Rev. Sci. Inst. Jul. 1970, vol. 41, No. 7. p. 909 American Institute of Physics, College Park, MD.

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