Granted Patent
Utility
US 5,654,899 · App. 08/130,853
Radiation instrument and method to measure radon and thoron concentration, air change rate and source emanation rate magnitudes
Inventor:
Bobby E. Leonard
Patented Case
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Granted: Aug 5, 1997
Filed: Oct 4, 1993
Inventor
Bobby E. Leonard
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.