Granted Patent
Utility
US 4,880,981 · App. 07/166,627
Low level radiation measurement device
Inventor:
Joseph G. Johnston
Patented Case
View Patent ↗
Granted: Nov 14, 1989
Filed: Mar 11, 1988
Inventor
Joseph G. Johnston
Assignee (at issue)
Bicron 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.