Granted Patent
Utility
US 6,134,763 · App. 09/148,044
Combined machining apparatus for making piston rings
Inventor:
Masahiro Shoji
Patented Case
View Patent ↗
Granted: Oct 24, 2000
Filed: Sep 3, 1998
Inventor
Masahiro Shoji
Assignee (at issue)
Komatsu Machinery Corporation Ltd.
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.