Granted Patent
Utility
US 5,226,950 · App. 07/899,467
Liquid-in-liquid sensor and method
Inventor:
Ho Yu
Patented Case
View Patent ↗
Granted: Jul 13, 1993
Filed: Jun 16, 1992
Inventor
Ho Yu
Assignee (at issue)
Aluminum Company of America
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.