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
J Vincent Fitzgerald: Motor vehicle map display system. January 26, 1982: US04312577 (58 worldwide citation)

A map display system for an automobile, in which a map is projected on a screen by optical magnification of a portion of a map disposed on a movable slide. A portion of the slide contains a list of locations such as cities, governmental institutions and points of interest, with an optical positionin ...


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 ...