Granted Patent
Utility
US 5,219,807 · App. 07/722,570
Burned high purity refractories with low soluble chromium
Inventors:
Stanley R. Pavlica, Dwight S. Whittemore
Patented Case
View Patent ↗
Granted: Jun 15, 1993
Filed: Jun 27, 1991
Inventors
Stanley R. Pavlica
Dwight S. Whittemore
Assignee (at issue)
Indresco Inc.
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.