Patents by Inventor Roy Balme

Roy Balme 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).

  • Piston pumps driven by fluid-actuated piston having a constant fluid force against the small area surface
    Patent number: 4068983
    Abstract: A reciprocating pump for liquids has a shuttle valve for directing motive fluid alternatively to small- and large-area faces of a piston. The motive fluid directed to the small-area face acts as a spring for causing reciprocation.
    Type: Grant
    Filed: July 28, 1975
    Date of Patent: January 17, 1978
    Assignee: Charles S. Madan & Company Limited
    Inventors: Roy Balme, John Francis Perkins