Method and apparatus for measuring fluid viscosity using...

Horology: time measuring systems or devices – Time interval – Electrical or electromechanical

Reexamination Certificate

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C073S054130

Reexamination Certificate

active

10756003

ABSTRACT:
An apparatus uses electrical conductance to determine the start and stop times for viscosity measurements using efflux cups. An efflux cup and two probes are immersed and removed from the fluid. An electric current is applied between each probe and the efflux cup. A timer measures the elapsed time between a decrease in the electric current measured between a first probe and the efflux cup and a decrease in the electric current measured between a second probe and the efflux cup.

REFERENCES:
patent: 3187563 (1965-06-01), Tobias
patent: 3680362 (1972-08-01), Geerdes et al.
patent: 4662030 (1987-05-01), Cooper et al.
American Society for Testing Materials, “Standard Test Method for Viscosity by Dip-Type Viscosity Cups,” ASTM Designation D 4212-99, 1999.
Graymills Corporation, Graymills New Expanded Catalog, Sep. 1999.

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