Patents Represented by Attorney, Agent or Law Firm Norvell E. Wisdon, Jr.
  • Polyol ester lubricants for hermetically sealed refrigerating compressors
    Patent number: 6221272
    Abstract: A high quality lubricant for hermetically sealed domestic air conditioner and refrigerator compressors, especially those using chlorine free hydrofluorocarbon refrigerant working fluids, is provided by mixed esters of hindered polyols, most desirably pentaerythritol, with a mixture of carboxylic acids including at least some isopentanoic acid along with either or both of iso-nonanoic acid and dibasic acids such as adipic.
    Type: Grant
    Filed: September 29, 1995
    Date of Patent: April 24, 2001
    Assignee: Henkel Corporation
    Inventors: Nicholas E. Schnur, Eugene R. Zehler