Granted Patent
Utility
US 4,618,079 · App. 06/549,811
Refractory, heat-insulating slabs
Inventors:
Andrew Barnes, Gary K. Elliott, William MacFarlane, Stephen T. Pheasant
Patented Case
View Patent ↗
Granted: Oct 21, 1986
Filed: Nov 8, 1983
Inventors
Andrew Barnes
Gary K. Elliott
William MacFarlane
Stephen T. Pheasant
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.