1
J Vincent Fitzgerald, Frank J Matusik, Donald W Nelson: National Metal and Refining Company, Arthur L Lessler, June 25, 1985: US04524610 (74 worldwide citation)

A rotational vibratory viscometer-densitometer for in-line process control and similar applications, having an elastic hollow metal tube extending between two clamps, and a relatively rigid transverse yoke secured to the tube at a point midway between the clamps. The yoke has magnetically permeable ...


2
John V Fitzgerald, Teresa M Walsh, Frank J Matusik, John Stone, Edmond Dougherty, John Batton: Control circuitry for viscosity sensors. National Metal and Refining Company, Arthur L Lessler, October 8, 1991: US05054313 (51 worldwide citation)

Electronic control circuitry for obtaining precise inline process control data as to viscosity of fluids over a wide viscosity range, with high tolerance of ambient noise and vibration. An electromechanical transducer with an oscillating sensor is immersed in a flowing liquid, with the power require ...


3
J Vincent Fitzgerald, Frank J Matusik, Donald W Nelson: Incremental rotary viscometer. National Metal and Refining Company, Arthur L Lessler, November 10, 1981: US04299119 (24 worldwide citation)

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 spee ...


4
J Vincent Fitzgerald, Frank J Matusik, Donald W Nelson, John L Schrag: Apparatus and method for determining the viscoelasticity of liquids. National Metal and Refining Company, Arthur L Lessler, July 5, 1988: US04754640 (21 worldwide citation)

A rheometer for determining the viscoelasticity of a liquid from the mechanical impedance which the liquid presents to an oscillating surface. The incremental power required to maintain a fixed amplitude of oscillation of the surface upon immersion in the liquid is determined. The differential shift ...


5
Frank J Matusik, Donald W Nelson: National Metal and Refining Company, Arthur L Lessler, December 18, 1984: US04488427 (17 worldwide citation)

A torsional mode rotational vibratory viscometer having an elastic hollow metal sheath extending below a support plate and secured to the plate by a weld. A rigid rod is disposed within the sheath and welded to the lower end of the sheath. An immersible tip is also secured to the lower end of the sh ...


6
John V Fitzgerald, Frank J Matusik, John L Batton: National Metal Refining Company, Arthur L Lessler, June 7, 1994: US05317908 (10 worldwide citation)

A transducer for inline process control of highly viscous fluids at high pressure and high temperature having a torsionally oscillating sensor tip supported by a pressure resistant threaded body portion. The sensor tip, which includes a thermocouple to measure fluid temperature, is driven by a cross ...


7
Frank J Matusik, Donald W Nelson: National Metal and Refining Company, Arthur L Lessler, January 28, 1986: US04566181 (9 worldwide citation)

A torsional mode rotational vibratory viscometer having an elastic hollow metal sheath extending below a support plate and secured to the plate by a weld. A rigid rod is disposed within the sheath and welded to the lower end of the sheath. An immersible tip is also secured to the lower end of the sh ...