Granted Patent
Utility
US 5,531,961 · App. 08/386,699
Water impurity analyzer
Inventors:
Paul George Wright, Curtis W. Nicholls, Clifford LaRue McDonald, Jr.
Patented Case
View Patent ↗
Granted: Jul 2, 1996
Filed: Feb 10, 1995
Inventors
Paul George Wright
Curtis W. Nicholls
Clifford LaRue McDonald, Jr.
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.