Granted Patent
Utility
US 4,838,739 · App. 07/098,172
Ball nose end mill and method of manufacture
Inventor:
Daniel R. Stashko
Patented Case
View Patent ↗
Granted: Jun 13, 1989
Filed: Sep 18, 1987
Inventor
Daniel R. Stashko
Assignee (at issue)
GTE Valenite 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.