Granted Patent
Utility
US 4,853,539 · App. 07/059,050
Glow discharge mass spectrometer
Inventors:
David Hall, Neil E. Sanderson, Edward F. H. Hall
Patented Case
View Patent ↗
Granted: Aug 1, 1989
Filed: Jun 8, 1987
Inventors
David Hall
Neil E. Sanderson
Edward F. H. Hall
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.