Granted Patent
Utility
US 5,397,110 · App. 08/014,632
Refractory brick and method of making and using same
Inventors:
Bohus Brezny, David E. Shewmon
Patented Case
View Patent ↗
Granted: Mar 14, 1995
Filed: Feb 8, 1993
Inventors
Bohus Brezny
David E. Shewmon
Assignee (at issue)
NORTH AMERICAN REFRACTORIES 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.