Granted Patent
Utility
US 4,996,429 · App. 07/429,563
Pocket measuring instrument for measuring ionizing radiation
Inventor:
Werthmann Gunter
Patented Case
View Patent ↗
Granted: Feb 26, 1991
Filed: Oct 31, 1989
Inventor
Werthmann Gunter
Assignee (at issue)
Nokia Unterhaltungselektronik GmbH
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.