Granted Patent
Utility
US 4,536,274 · App. 06/486,024
pH and CO.sub.2 sensing device and method of making the same
Inventors:
Nicholas Papadakis, Daniel Kalynchuk
Patented Case
View Patent ↗
Granted: Aug 20, 1985
Filed: Apr 18, 1983
Inventors
Nicholas Papadakis
Daniel Kalynchuk
Assignee (at issue)
Diamond Shamrock Chemicals Company
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.