Granted Patent
Utility
US 4,535,236 · App. 06/582,789
Apparatus for and method of operating quadrupole mass spectrometers in the total pressure mode
Inventor:
Jonathan Hugh Batey
Patented Case
View Patent ↗
Granted: Aug 13, 1985
Filed: Feb 23, 1984
Inventor
Jonathan Hugh Batey
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.