Granted Patent
Utility
US 5,347,474 · App. 07/762,396
Self-calibration of an NDIR gas sensor
Inventor:
Jacob Y. Wong
Patented Case
View Patent ↗
Granted: Sep 13, 1994
Filed: Sep 19, 1991
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.