Patents by Inventor Charles L. Keith

Charles L. Keith 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).

  • Axle weight distribution controller
    Patent number: 4789038
    Abstract: An axle weight distribution controller for maintaining the weight borne by the steering axle of a load-carrying vehicle. A load transducer attached to the steering axle produces an electrical signal that is compared with signals representing desired minimum and maximum loads to be borne by the steering axle. If the load borne by the steering axle falls outside of the predetermined load interval, the pressure in an air spring supporting a third axle is adjusted so as to redistribute the weight borne by each of the other axles in the vehicle and to bring the load borne by the steering axle within desired limits.
    Type: Grant
    Filed: March 12, 1987
    Date of Patent: December 6, 1988
    Assignee: Structural Instrumentation, Inc.
    Inventors: Phong T. Nguyen, Charles L. Keith, Jerry L. McCauley