Patents Assigned to Thomas Roach
  • Vane type pump with optional high rate of flow or high pressure characteristics
    Patent number: 4133617
    Abstract: An improved vane type pump capable of operating either as a high rate of flow or high pressure pump change of rotation only is disclosed. The construction, arrangement and dimensioning of the operative elements of the improved vane type pump provides an angle of intercommunication between inlet and outlet means during rotation and an automatic liquid seal to assure an uninterrupted flow of liquid being pumped through inlet means for discharge through outlet means.
    Type: Grant
    Filed: March 24, 1977
    Date of Patent: January 9, 1979
    Assignee: Thomas Roach
    Inventor: Denis A. L. M. Reynaud