Granted Patent
Utility
US 4,544,643 · App. 06/619,510
Refractory fused chrome-alumina bricks and compositions made from a granular fused material and processes for their production
Inventor:
Teresa M. Fraser
Patented Case
View Patent ↗
Granted: Oct 1, 1985
Filed: Jun 11, 1984
Inventor
Teresa M. Fraser
Assignee (at issue)
Dresser Industries, 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.