Granted Patent
Utility
US 5,800,775 · App. 08/760,943
Refractory block slag dam
Inventors:
Robert S. Vihnicka, Richard L. Meskimen
Patented Case
View Patent ↗
Granted: Sep 1, 1998
Filed: Dec 9, 1996
Inventors
Robert S. Vihnicka
Richard L. Meskimen
Assignee (at issue)
Commonwealth Edison Company
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.