Granted Patent
Utility
US 4,299,110 · App. 06/045,529
Method for forming a hole through a forged workpiece
Inventor:
Wayne A. Martin
Patented Case
View Patent ↗
Granted: Nov 10, 1981
Filed: Jun 4, 1979
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.