Granted Patent
Utility
US 4,991,443 · App. 07/428,142
Vibration testing system
Inventors:
David L. Fowler, Dennis P. Gregory
Patented Case
View Patent ↗
Granted: Feb 12, 1991
Filed: Oct 27, 1989
Inventors
David L. Fowler
Dennis P. Gregory
Assignee (at issue)
Hughes Aircraft Company
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.