Granted Patent
Utility
US 5,145,575 · App. 07/770,663
Water quality monitor for a water purification system
Inventor:
Bruce D. Burrows
Patented Case
View Patent ↗
Granted: Sep 8, 1992
Filed: Oct 2, 1991
Inventor
Bruce D. Burrows
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.