Patents by Inventor Richard L. Crooker

Richard L. Crooker 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).

  • Electrically conductive chair support with sliding bushing
    Patent number: 4964015
    Abstract: A chair for conducting the electrostatic charge of an occupant to the floor on which the chair rests, with the chair seat carried on a support unit which permits rotation of the seat and adjustment of the height of the seat above the floor. The support unit includes an outer sleeve and an inner sleeve moving vertically relative to the outer sleeve, and an electrical resistor connected between the inner and outer sleeves and in sliding contact with at least one of the sleeves, typically by means of a spring finger strip mounted in a groove of a bushing or collar.
    Type: Grant
    Filed: March 27, 1989
    Date of Patent: October 16, 1990
    Assignee: Zero Corporation
    Inventors: Richard L. Crooker, Vincent J. Fitzgerald, Jeffery D. Campbell