Granted Patent
Utility
US 4,975,656 · App. 07/332,628
Enhanced secondary electron emitter
Inventors:
Gregory T. Schaeffer, John C. Cipolla, Guilford R. MacPhail
Patented Case
View Patent ↗
Granted: Dec 4, 1990
Filed: Mar 31, 1989
Inventors
Gregory T. Schaeffer
John C. Cipolla
Guilford R. MacPhail
Assignee (at issue)
Litton Systems, 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.