Granted Patent
Utility
US 5,166,074 · App. 07/609,850
Method of detecting the initial concentration of a water-treatment chemical in a diluted aqueous system
Inventors:
Adrian M. Vessey, David S. Ryder
Patented Case
View Patent ↗
Granted: Nov 24, 1992
Filed: Nov 7, 1990
Inventors
Adrian M. Vessey
David S. Ryder
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.