Granted Patent
Utility
US 4,444,146 · App. 06/339,196
Ultrasonic subsurface cleaning
Inventors:
Gerhard H. De Witz, Bernard W. Yaeger
Patented Case
View Patent ↗
Granted: Apr 24, 1984
Filed: Jan 13, 1982
Inventors
Gerhard H. De Witz
Bernard W. Yaeger
Assignee (at issue)
Honeywell Limited
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.