Granted Patent
Utility
US 4,983,843 · App. 07/342,336
Radon detector
Inventor:
Ian Thomson
Patented Case
View Patent ↗
Granted: Jan 8, 1991
Filed: Apr 24, 1989
Inventor
Ian Thomson
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.