Granted Patent
Utility
US 4,787,980 · App. 06/914,093
Ultra pure water system monitoring
Inventors:
Arthur John Ackermann, Robert A. Craven
Patented Case
View Patent ↗
Granted: Nov 29, 1988
Filed: Oct 1, 1986
Inventors
Arthur John Ackermann
Robert A. Craven
Assignee (at issue)
Monsanto 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.