Granted Patent
Utility
US 6,687,640 · App. 10/000,930
Airborne agent concentration analysis
Inventor:
Fred Gelbard
Patented Case
View Patent ↗
Granted: Feb 3, 2004
Filed: Oct 23, 2001
Inventor
Fred Gelbard
Assignee (at issue)
Sandia Corporation
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.