Granted Patent
Utility
US 5,123,433 · App. 07/356,162
Ultrasonic flow nozzle cleaning apparatus
Inventors:
Daniel E. Fridsma, George J. Silvestri, Jr., Michael Twerdochlib
Patented Case
View Patent ↗
Granted: Jun 23, 1992
Filed: May 24, 1989
Inventors
Daniel E. Fridsma
George J. Silvestri, Jr.
Michael Twerdochlib
Assignee (at issue)
Westinghouse Electric Company LLC
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.