Granted Patent
Utility
US 4,879,005 · App. 07/247,567
Electrochemical sensor for hydrogen sensing
Inventors:
Derek John Fray, David R. Morris
Patented Case
View Patent ↗
Granted: Nov 7, 1989
Filed: Sep 22, 1988
Inventors
Derek John Fray
David R. Morris
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.