Granted Patent
Utility
US 6,662,627 · App. 09/888,251
Photoacoustic instrument for measuring particles in a gas
Inventors:
William Patrick Arnott, Hans Moosmuller, John W. Walker
Patented Case
View Patent ↗
Granted: Dec 16, 2003
Filed: Jun 22, 2001
Inventors
William Patrick Arnott
Hans Moosmuller
John W. Walker
Assignee (at issue)
on Behalf of the Desert Research Institute
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.