Granted Patent
Utility
US 5,083,019 · App. 07/571,172
Preconcentrator for ion mobility spectrometer
Inventor:
Glenn E. Spangler
Patented Case
View Patent ↗
Granted: Jan 21, 1992
Filed: Aug 21, 1990
Inventor
Glenn E. Spangler
Assignee (at issue)
Environmental Technologies, LLC
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.