Patents by Inventor Jon L. Shafer

Jon L. Shafer 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).

  • Control for hydraulic accumulator system
    Patent number: 4278403
    Abstract: A hydraulic accumulator system comprising an accumulator tank (22) for storing hydraulic fluid supplied by a pump (P) from reservoir (10), the stored fluid being pressurized by gas from gas tank (28), a control tank (35)connected at one end to the fluid supply (10) and at the other end to the gas supply (28), and a piston (36) in said control tank (35) having differential areas exposed to said fluid and said gas, said piston having means (41) for actuating a switch (43) to control said pump (P).
    Type: Grant
    Filed: September 6, 1979
    Date of Patent: July 14, 1981
    Inventor: Jon L. Shafer
  • Hand pump system for hydraulic motor
    Patent number: 4102128
    Abstract: A hand pump system which allows normal automatic operation of a fluid motor operator for a pipeline valve by pipeline pressure, and also provides a stand-by hand pump while may be manually connected to a pressure fluid storage in the system for operating the fluid motor operator in either direction. The hand pump is connected into the system in such manner as to prevent accidental actuation of the pump handle by a pressure surge in the pipeline.
    Type: Grant
    Filed: July 1, 1977
    Date of Patent: July 25, 1978
    Assignee: Shafer Valve Company
    Inventors: Jon L. Shafer, William K. LeBlanc