Granted Patent
Utility
US 6,509,562 · App. 09/397,625
Selective photo-ionization detector using ion mobility spectrometry
Inventors:
Wenjun Yang, Peter Hsi
Patented Case
View Patent ↗
Granted: Jan 21, 2003
Filed: Sep 16, 1999
Inventors
Wenjun Yang
Peter Hsi
Assignee (at issue)
RAE SYSTEMS, INC.
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.