Patents Assigned to I.sup.2 DS
  • Sump pump control system
    Patent number: 4222711
    Abstract: An AC driven pump and a DC driven pump are positioned in a sump and respectively energized as the liquid in the sump reaches two different levels, the DC driven pump being automatically tested for operation after every predetermined number of pumping cycles of the AC driven pump.
    Type: Grant
    Filed: June 22, 1978
    Date of Patent: September 16, 1980
    Assignee: I.sup.2 DS
    Inventor: Thomas J. Mayer