Granted Patent
Utility
US 5,198,915 · App. 07/634,122
Underwater inspection apparatus and method
Inventor:
John D. Watson
Patented Case
View Patent ↗
Granted: Mar 30, 1993
Filed: Dec 31, 1990
Inventor
John D. Watson
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT CORPORATION
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.