Patents Assigned to PSi
  • Extra-discal inter-vertebral prosthesis for controlling the variations of the inter-vertebral distance by means of a double damper
    Patent number: 5480401
    Abstract: A prosthesis with double damper performing the function of intervertebral stabilizer which comprises at least two identical elements assembled together and comprising elastic bodies for regulating the bending-stretching movement between two vertebrae so as to approach as closely as possible the physiological course of a discal movement.
    Type: Grant
    Filed: February 10, 1994
    Date of Patent: January 2, 1996
    Assignee: PSI
    Inventor: Fernand Navas
  • Vehicle and track system
    Patent number: 4791872
    Abstract: A vehicle for use in a track system of the type having a rotating drive shaft extending along and parallel to an elongated track has a drive wheel mounted to extend from the side of the vehicle for driving contact with the rotating drive shaft. The vehicle has a speed control means actuated by control members extending from both the front and the rear of the vehicle.
    Type: Grant
    Filed: March 30, 1987
    Date of Patent: December 20, 1988
    Assignee: PSi
    Inventor: Terrance E. McGinn