Granted Patent
Utility
US 4,898,829 · App. 07/132,267
Apparatus for the detection of biodegradable and toxic substances in aqueous solutions
Inventors:
Friedrich W. Siepmann, Michael Teutscher
Patented Case
View Patent ↗
Granted: Feb 6, 1990
Filed: Dec 14, 1987
Inventors
Friedrich W. Siepmann
Michael Teutscher
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.