Granted Patent
Utility
US 4,596,601 · App. 06/677,422
High strength coke-oven mortar
Inventor:
Roger L. Rueckl
Patented Case
View Patent ↗
Granted: Jun 24, 1986
Filed: Dec 3, 1984
Inventor
Roger L. Rueckl
Assignee (at issue)
United States Steel Corporation
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.