1
Steven H Petrofsky, William G Gruesbeck: Computer controlled hydraulic resistance device for a prosthesis and other apparatus. Mauch, Jacox Meckstroth & Jenkins, September 5, 2000: US06113642 (111 worldwide citation)

A computer controlled hydraulic resistance device for apparatus such as a prosthetic knee for above knee amputees, includes a two stage pilot operated solenoid valve connected to control the flow of hydraulic fluid to and from a hydraulic actuator which applies resistance to the prosthetic knee or o ...


2
Daniel W Repperger, Donald G McCollor, William G Gruesbeck: Stabilizing force feedback in bio-actuated control systems. The United States of America represented by the Secretary of the Air Force, Gerald B Hollins, Donald J Singer, December 30, 1986: US04632341 (108 worldwide citation)

A biomechanical feedback arrangement wherein a varying force tending to improve the neuromotor tracking response of a human subject, particularly in the presence of lateral or front-back G force fields, is added to the test subject input member of a feedback control system. Use of the biomechanical ...


3
William G Gruesbeck: Controller system for rotary actuator. Ex Cell O Corporation, Frank D Risko, John C Evans, August 4, 1981: US04282467 (8 worldwide citation)

This invention relates to the hydraulic control field wherein an electronic controller provides the necessary electrical elements for controlling the movement of an actuator shaft from one pre-selected position to another pre-selected position at a pre-selected velocity and provided with an automati ...


4
Steven H Petrofsky, William G Gruesbeck: Computer controlled hydraulic resistance device for a prosthesis and other apparatus. Ă–SSUR hf, Knobbe Martens Olson & Bear, December 25, 2007: USRE039961

A computer controlled hydraulic resistance device for apparatus such as a prosthetic knee for above knee amputees, includes a two stage pilot operated solenoid valve connected to control the flow of hydraulic fluid to and from a hydraulic actuator which applies resistance to the prosthetic knee or o ...