Granted Patent
Utility
US 5,453,621 · App. 08/301,884
Enhanced pathlength gas sample chamber
Inventor:
Jacob Y. Wong
Patented Case
View Patent ↗
Granted: Sep 26, 1995
Filed: Sep 7, 1994
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.