Granted Patent
Utility
US 4,900,603 · App. 06/568,708
Refractory, heat insulating articles
Inventors:
Michel S. Boily, James R. Flood
Patented Case
View Patent ↗
Granted: Feb 13, 1990
Filed: Jan 6, 1984
Inventors
Michel S. Boily
James R. Flood
Assignee (at issue)
Foseco Trading A.G.
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.