Granted Patent
Utility
US 4,320,656 · App. 06/173,220
Thermocouple apparatus for indicating liquid level in a container
Inventor:
John R. Tiskus
Patented Case
View Patent ↗
Granted: Mar 23, 1982
Filed: Jul 28, 1980
Inventor
John R. Tiskus
Assignee (at issue)
United States Steel Corporation
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.