Granted Patent
Utility
US 5,833,876 · App. 08/482,632
Polyol ester lubricants for refrigerating compressors operating at high temperatures
Inventors:
Nicholas E. Schnur, Eugene R. Zehler
Patented Case
View Patent ↗
Granted: Nov 10, 1998
Filed: Jun 7, 1995
Inventors
Nicholas E. Schnur
Eugene R. Zehler
Assignee (at issue)
Henkel Limited
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.