Granted Patent
Utility
US 6,527,398 · App. 09/590,321
Tubular-waveguide gas sample chamber for optical spectrometer, and related methods
Inventor:
Gregory J. Fetzer
Patented Case
View Patent ↗
Granted: Mar 4, 2003
Filed: Jun 8, 2000
Inventor
Gregory J. Fetzer
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.