Granted Patent
Utility
US 5,698,774 · App. 08/706,003
Apparatus and method for determining concentrations of oil or other non-volatile contaminants in cleaning solvents
Inventor:
Frank A. Osmanski
Patented Case
View Patent ↗
Granted: Dec 16, 1997
Filed: Aug 30, 1996
Inventor
Frank A. Osmanski
Assignee (at issue)
SAFETY KLEEN CORPORATION
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.