Granted Patent
Utility
US 5,643,797 · App. 08/495,433
Process of continuously controlling the pH of an acid liquid including measuring the pH continuously with a glass electrode
Inventors:
Hans-Jurgen Schmidt, Bertold Stegemann
Patented Case
View Patent ↗
Granted: Jul 1, 1997
Filed: Jul 5, 1995
Inventors
Hans-Jurgen Schmidt
Bertold Stegemann
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.