Granted Patent
Utility
US 5,120,957 · App. 07/765,485
Apparatus and method for the control and/or analysis of charged particles
Inventor:
Iwan W. Griffiths
Patented Case
View Patent ↗
Granted: Jun 9, 1992
Filed: Sep 25, 1991
Inventor
Iwan W. Griffiths
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.