Dragging And Scrubbing Patents (Class 68/56)
Drag on vertical axis (Class 68/57)
  • Blended polyol ester lubricants for refrigerant heat transfer fluids
    Patent number: 5820777
    Abstract: From not more than three blending stocks, it is possible to prepare a wide variety of mixtures of esters of hindered polyhydric alcohols that are especially valuable lubricants for chlorine-free fluorocarbon refrigerant heat transfer fluids, particularly Refrigerant 134a (1,1,1,2-tetrafluoroethane).
    Type: Grant
    Filed: January 21, 1997
    Date of Patent: October 13, 1998
    Assignee: Henkel Corporation
    Inventors: Nicholas E. Schnur, Eugene R. Zehler