Granted Patent
Utility
US 5,502,308 · App. 08/279,915
Diffusion-type gas sample chamber
Inventor:
Jacob Y. Wong
Patented Case
View Patent ↗
Granted: Mar 26, 1996
Filed: Jul 25, 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.