Granted Patent
Utility
US 5,166,518 · App. 07/804,361
Mass spectrometer with electrostatic energy filter
Inventor:
Philip A. Freedman
Patented Case
View Patent ↗
Granted: Nov 24, 1992
Filed: Dec 9, 1991
Inventor
Philip A. Freedman
Assignee (at issue)
Fisons plc
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.