Granted Patent
Utility
US 4,980,556 · App. 07/492,428
Apparatus for generating high currents of negative ions
Inventors:
John P. O'Connor, Nicholas R. White
Patented Case
View Patent ↗
Granted: Dec 25, 1990
Filed: Mar 6, 1990
Inventors
John P. O'Connor
Nicholas R. White
Assignee (at issue)
Ionex/HEI Corporation
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.