Granted Patent
Utility
US 4,835,365 · App. 07/035,058
De-ionized fluid heater and control system
Inventor:
David Etheridge
Patented Case
View Patent ↗
Granted: May 30, 1989
Filed: Apr 6, 1987
Inventor
David Etheridge
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.