Granted Patent
Utility
US 5,863,400 · App. 08/727,504
Electrochemical cells
Inventors:
Humphrey John Jardine Drummond, Thomas William Beck
Patented Case
View Patent ↗
Granted: Jan 26, 1999
Filed: Feb 24, 1997
Inventors
Humphrey John Jardine Drummond
Thomas William Beck
Assignee (at issue)
USF Filtration and Separations Group, 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.