Granted Patent
Utility
US 5,393,979 · App. 08/061,418
Photo-ionization detector for detecting volatile organic gases
Inventor:
Peter Hsi
Patented Case
View Patent ↗
Granted: Feb 28, 1995
Filed: May 12, 1993
Inventor
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.