Granted Patent
Utility
US 4,313,757 · App. 05/862,202
Process for upgrading iron ore pellets
Inventor:
Kazuo Kiyonoga
Patented Case
View Patent ↗
Granted: Feb 2, 1982
Filed: Dec 19, 1977
Inventor
Kazuo Kiyonoga
Assignee (at issue)
Union Carbide 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.