Granted Patent
Utility
US 5,844,147 · App. 08/814,950
Method and apparatus for water sampling utilizing solid phase extraction
Inventors:
Robert R. Fiedler, Dale A. Davison
Patented Case
View Patent ↗
Granted: Dec 1, 1998
Filed: Mar 10, 1997
Inventors
Robert R. Fiedler
Dale A. Davison
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.