04299119 is referenced by 24 patents and cites 7 patents.

A rotary viscometer of the type which measures the viscous torque to which a rotating spindle is subjected, by measuring the current drawn by the electric motor driving the spindle. True viscosity, i.e. the slope of the torque-spindle rotation speed curve, is approximated by varying the spindle speed stepwise in sets of speed measurements having a fixed speed difference, and obtaining the difference between the corresponding torque values for each set. By repeating this process throughout the desired speed range, an approximate derivative of the torque-speed curve is obtained, corresponding to an approximation of the true viscosity of the fluid being characterized.

Title
Incremental rotary viscometer
Application Number
6/129984
Publication Number
4299119
Application Date
March 13, 1980
Publication Date
November 10, 1981
Inventor
Donald W Nelson
Voorhees
NJ, US
Frank J Matusik
Piscataway
NJ, US
J Vincent Fitzgerald
Metuchen
NJ, US
Agent
Arthur L Lessler
Assignee
National Metal and Refining Company
NJ, US
IPC
G01N 11/14
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