Granted Patent
Utility
US 4,869,883 · App. 07/211,484
Inert gas purifier for bulk nitrogen without the use of hydrogen or other reducing gases
Inventors:
Robert M. Thorogood, William T. Kleinberg
Patented Case
View Patent ↗
Granted: Sep 26, 1989
Filed: Jun 24, 1988
Inventors
Robert M. Thorogood
William T. Kleinberg
Assignee (at issue)
Air Products and Chemicals, Inc.
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.