Granted Patent
Utility
US 5,497,652 · App. 08/142,466
Method and apparatus for evaluating quantities of absorbed impurities
Inventor:
Tadahiro Ohmi
Patented Case
View Patent ↗
Granted: Mar 12, 1996
Filed: Jan 31, 1994
Inventor
Tadahiro Ohmi
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.