Granted Patent
Utility
US 5,851,968 · App. 08/552,444
Increasing the electrical resistivity of ester lubricants, especially for use with hydrofluorocarbon refrigerants
Inventor:
Nicholas E. Schnur
Patented Case
View Patent ↗
Granted: Dec 22, 1998
Filed: Nov 3, 1995
Inventor
Nicholas E. Schnur
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.