Patents Assigned to Charles S. Madan & Company Limited
  • 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