Granted Patent
Utility
US 4,818,361 · App. 07/126,438
Combined pH and dissolved carbon dioxide gas sensor
Inventors:
Bruce Harold Burgess, Glenn Martin
Patented Case
View Patent ↗
Granted: Apr 4, 1989
Filed: Nov 30, 1987
Inventors
Bruce Harold Burgess
Glenn Martin
Assignee (at issue)
Diamond Sensor Systems
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.