Granted Patent
Utility
US 6,285,291 · App. 09/171,886
Detection of airborne pollutants
Inventors:
Ronald Knox, Christopher Ryan, Hugh Charles Stevenson
Patented Case
View Patent ↗
Granted: Sep 4, 2001
Filed: Oct 28, 1998
Inventors
Ronald Knox
Christopher Ryan
Hugh Charles Stevenson
Assignee (at issue)
Vision Products Pty. Ltd.
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.