Granted Patent
Utility
US 5,391,986 · App. 08/056,771
Apparatus for determining the proportion of a substance having paramagnetic properties in a mixture of substances
Inventor:
Thomas Sauerbaum
Patented Case
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Granted: Feb 21, 1995
Filed: May 4, 1993
Inventor
Thomas Sauerbaum
Assignee (at issue)
DRAGERWERK AKTIEGESELLSCHAFT
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.