Granted Patent
Utility
US 4,891,102 · App. 07/041,636
Method of determining carbon dioxide in the presence of oxygen
Inventors:
Wyndham J. Albery, Anthony J. M. Coombs, Humphrey John Jardine Drummond, Clive Hahn
Patented Case
View Patent ↗
Granted: Jan 2, 1990
Filed: Apr 23, 1987
Inventors
Wyndham J. Albery
Anthony J. M. Coombs
Humphrey John Jardine Drummond
Clive Hahn
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.