Granted Patent
Utility
US 5,994,146 · App. 09/224,067
Water impurity analysis method
Inventors:
Paul George Wright, Robert W. Allington, Curtis W. Nicholls, Clifford LaRue McDonald, Jr.
Patented Case
View Patent ↗
Granted: Nov 30, 1999
Filed: Dec 31, 1998
Inventors
Paul George Wright
Robert W. Allington
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.