Granted Patent
Utility
US 4,778,993 · App. 07/090,379
Time-of-flight mass spectrometry
Inventor:
Allen Robert Waugh
Patented Case
View Patent ↗
Granted: Oct 18, 1988
Filed: Aug 28, 1987
Inventor
Allen Robert Waugh
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.