Granted Patent
Utility
US 4,945,654 · App. 07/342,981
Application of superheated steam
Inventor:
Robert J. Mason
Patented Case
View Patent ↗
Granted: Aug 7, 1990
Filed: Apr 20, 1989
Inventor
Robert J. Mason
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.