Granted Patent
Utility
US 4,769,542 · App. 06/928,038
Charged particle energy analyzer
Inventor:
Peter Rockett
Patented Case
View Patent ↗
Granted: Sep 6, 1988
Filed: Nov 7, 1986
Inventor
Peter Rockett
Assignee (at issue)
VG Instruments Group Limited
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.