Granted Patent
Utility
US 5,222,389 · App. 07/816,596
Multi-channel gas sample chamber
Inventor:
Jacob Y. Wong
Patented Case
View Patent ↗
Granted: Jun 29, 1993
Filed: Dec 31, 1991
Inventor
Jacob Y. Wong
Assignee (at issue)
Gaztech International 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.