Granted Patent
Utility
US 4,963,059 · App. 07/317,067
Rotary cutting tool
Inventor:
Nobuo Hiyama
Patented Case
View Patent ↗
Granted: Oct 16, 1990
Filed: Feb 24, 1989
Inventor
Nobuo Hiyama
Assignee (at issue)
Izumo Industrial Co., Lts.
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.