Granted Patent
Utility
US 4,304,115 · App. 06/186,033
Method for forging rolling mill couplings
Inventor:
Wayne A. Martin
Patented Case
View Patent ↗
Granted: Dec 8, 1981
Filed: Sep 11, 1980
Inventor
Wayne A. Martin
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.