Granted Patent
Utility
US 5,269,832 · App. 07/893,233
Method and apparatus for continuously measuring the concentration of chemicals in solutions
Inventor:
Robert S. Meijer
Patented Case
View Patent ↗
Granted: Dec 14, 1993
Filed: Jun 3, 1992
Inventor
Robert S. Meijer
Assignee (at issue)
Winfield Industries
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.