Patents Assigned to Industrial Filter & Pump Manufacturing Co.
  • Process for manufacturing a filter aid
    Patent number: 4452707
    Abstract: In the extraction of coal the liquid coal extract is filtered using a filter aid produced by washing the filter cake with a low viscosity, high boiling point, low vapor pressure ester and then calcining the cake to remove the wash solvent and other combustible constituents from the cake.
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: June 5, 1984
    Assignee: Industrial Filter & Pump Manufacturing Co.
    Inventors: James F. Zievers, Paul Eggerstedt