Granted Patent
Utility
US 6,178,831 · App. 08/882,089
Composite wastewater sampler
Inventors:
Brian D. Dawson, Richard D. Hartz
Patented Case
View Patent ↗
Granted: Jan 30, 2001
Filed: Jun 25, 1997
Inventors
Brian D. Dawson
Richard D. Hartz
Assignee (at issue)
Isco, Inc.
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.