Granted Patent
Utility
US 4,874,943 · App. 06/695,847
Mass spectrometer ion excitation system
Inventor:
Robert B. Spencer
Patented Case
View Patent ↗
Granted: Oct 17, 1989
Filed: Jan 28, 1985
Inventor
Robert B. Spencer
Assignee (at issue)
Nicolet Instrument 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.