Granted Patent
Utility
US 4,896,461 · App. 07/180,214
Internal grinding machine
Inventor:
Hideki Enosawa
Patented Case
View Patent ↗
Granted: Jan 30, 1990
Filed: Apr 11, 1988
Inventor
Hideki Enosawa
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.