Granted Patent
Utility
US 4,817,653 · App. 07/147,237
Tank cleaning, water washing robot
Inventors:
Richard W. Krajicek, Robert R. Cradeur
Patented Case
View Patent ↗
Granted: Apr 4, 1989
Filed: Jan 22, 1988
Inventors
Richard W. Krajicek
Robert R. Cradeur
Assignee (at issue)
Servi-Tech, Inc
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.