Granted Patent
Utility
US 5,186,841 · App. 07/787,825
Cooling water ozonation system
Inventor:
Robert P. Schick
Patented Case
View Patent ↗
Granted: Feb 16, 1993
Filed: Nov 5, 1991
Inventor
Robert P. Schick
Assignee (at issue)
Praxair Technology, Inc.
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.