Granted Patent
Utility
US 5,955,044 · App. 08/941,530
Method and apparatus for making ultra-pure hydrogen
Inventors:
Jeffrey Lucht, Thomas Hsiao-Ling Hsiung
Patented Case
View Patent ↗
Granted: Sep 21, 1999
Filed: Sep 30, 1997
Inventors
Jeffrey Lucht
Thomas Hsiao-Ling Hsiung
Assignees (at issue)
Johnson Matthey Inc.
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.