Granted Patent
Utility
US 5,981,917 · App. 09/146,778
Ladle preheat indication system
Inventors:
Richard J. Groth, Roberto Bandelli
Patented Case
View Patent ↗
Granted: Nov 9, 1999
Filed: Sep 4, 1998
Inventors
Richard J. Groth
Roberto Bandelli
Assignee (at issue)
USX 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.