Granted Patent
Utility
US 5,026,992 · App. 07/403,587
Spectral ratioing technique for NDIR gas analysis using a differential temperature source
Inventor:
Jacob Y. Wong
Patented Case
View Patent ↗
Granted: Jun 25, 1991
Filed: Sep 6, 1989
Inventor
Jacob Y. Wong
Assignee (at issue)
Gaztech 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.