Granted Patent
Utility
US 5,652,397 · App. 08/424,226
Composite wastewater sampler
Inventors:
Brian D. Dawson, Richard D. Hartz
Patented Case
View Patent ↗
Granted: Jul 29, 1997
Filed: Apr 19, 1995
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.