Granted Patent
Utility
US 4,687,940 · App. 06/842,103
Hybrid focused-flood ion beam system and method
Inventors:
J. William Ward, John L. Bartelt, Robert L. Seliger, Charles M. McKenna
Patented Case
View Patent ↗
Granted: Aug 18, 1987
Filed: Mar 20, 1986
Inventors
J. William Ward
John L. Bartelt
Robert L. Seliger
Charles M. McKenna
Assignee (at issue)
Hughes Aircraft Company
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.