Patents by Inventor David T. Erickson

David T. Erickson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Hydraulic exercising device
    Patent number: 4444390
    Abstract: An exercise device of the weight lifting type wherein the force or load conventionally supplied by weights is effectively simulated by fluid means such as a hydraulic assembly. One or more hydraulic assemblies act upon a reaction bar to tend to move it one direction. The exercising person engages the reaction bar and exerts force upon it in the direction opposite to the force exerted by the hydraulic assemblies. Force is exerted in a direction opposite to the direction of the force exerted by the hydraulic assembly in both in an extension and retraction phase of the exerciser's routine.
    Type: Grant
    Filed: September 7, 1982
    Date of Patent: April 24, 1984
    Inventor: David T. Erickson
  • Exercise device
    Patent number: 4363481
    Abstract: An exercise device of the weight lifting type wherein the force or load conventionally supplied by weights is effectively simulated by fluid means such as a hydraulic assembly. One or more hydraulic assemblies act upon a reaction bar to tend to move it one direction. The exercising person engages the reaction bar and exerts force upon it in the direction opposite to the force exerted by the hydraulic assemblies. Force is exerted in a direction opposite to the direction of the force exerted by the hydraulic assembly in both in an extension and retraction phase of the exerciser's routine.
    Type: Grant
    Filed: November 20, 1980
    Date of Patent: December 14, 1982
    Inventor: David T. Erickson