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
Fitzgerald J Vincent, Matusik Frank J, Oppliger Hans R: High precision wide dynamic range viscous loss measuring apparatus. National Metal and Refining Company, January 23, 1973: US3712117 (32 worldwide citation)

A viscosity measuring system especially useful in pollution and chemical process control applications. A variable gain amplifier drives a magnetic coil which causes a torsion member to oscillate. The amplitude of the oscillations is sensed by a transducer, and converted to a DC voltage by an amplitu ...


4
Fitzgerald John Vincent, Matusik Frank J, Dallenbach Raymond M: Variable shear rate, wide dynamic range true indicating viscometer. National Metal and Refining Company, Lessler Arthur L, April 8, 1975: US3875791 (26 worldwide citation)

A viscosity measuring system of the rotational viscometer type, in which a spindle is secured to one end of a shaft the other end of which is rigidly attached to a drive motor. A precision electronic control system maintains the angular speed of rotation of the motor, shaft and spindle at a desired ...


5
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 ...


6
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 ...


7
Oppliger Hans R: High precision wide dynamic range viscous loss measuring apparatus. National Metal and Refining Company, January 16, 1973: US3710614 (19 worldwide citation)

A viscosity measuring system especially useful in pollution and chemical process control applications. A variable gain amplifier drives a magnetic coil which causes a vibratory member to oscillate. The amplitude of the oscillations is sensed as an AC voltage by a transducer, and converted to a DC vo ...


8
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 ...


9
John V Fitzgerald, Teresa M Walsh: National Metal and Refining Company, Arthur L Lessler, October 27, 1992: US05157962 (13 worldwide citation)

A viscosity measuring transducer especially useful for process control of fluids. The transducer oscillates an immersed blade sensor in the direction of the plane of the blade in order to maximize generation of shear waves and to minimize generation of compression waves. The transducer includes a ba ...


10
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 ...