Granted Patent
Utility
US 4,950,419 · App. 07/169,400
Process, composition, and apparatus for purifying inert gases to remove lewis acid and oxidant impurities therefrom
Inventors:
Glenn M. Tom, Duncan W. Brown
Patented Case
View Patent ↗
Granted: Aug 21, 1990
Filed: Mar 17, 1988
Inventors
Glenn M. Tom
Duncan W. Brown
Assignee (at issue)
ADVANCED TECHNOLOGY & MATERIALS CO., LTD.
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.