Granted Patent
Utility
US 4,649,687 · App. 06/330,982
Refractory structure and method
Inventor:
Erie M. Harvey
Patented Case
View Patent ↗
Granted: Mar 17, 1987
Filed: Dec 15, 1981
Inventor
Erie M. Harvey
Assignee (at issue)
RESCO PRODUCTS, 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.