Granted Patent
Utility
US 4,566,308 · App. 06/667,988
Portable pressure gauge tester
Inventor:
Robert Powell
Patented Case
View Patent ↗
Granted: Jan 28, 1986
Filed: Nov 5, 1984
Inventor
Robert Powell
Assignee (at issue)
Amerex 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.