Granted Patent
Utility
US 4,586,295 · App. 06/684,609
Workpiece centerless support device for use in internal grinding machine
Inventor:
Katsutoshi Ishii
Patented Case
View Patent ↗
Granted: May 6, 1986
Filed: Dec 21, 1984
Inventor
Katsutoshi Ishii
Assignee (at issue)
Seiko Seiki Kabushiki Kaisha
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.