Granted Patent
Utility
US 6,225,633 · App. 09/177,669
Photo-ionization detector for volatile gas measurement and a method for self-cleaning the same
Inventors:
Hong T. Sun, Peter Hsi
Patented Case
View Patent ↗
Granted: May 1, 2001
Filed: Oct 22, 1998
Inventors
Hong T. Sun
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.