Granted Patent
Utility
US 5,840,172 · App. 08/823,987
Direct current hydrogen generator, system and method
Inventor:
George Zugravu
Patented Case
View Patent ↗
Granted: Nov 24, 1998
Filed: Mar 25, 1997
Inventor
George Zugravu
Assignee (at issue)
Whatman GmbH
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.