Granted Patent
Utility
US 4,812,692 · App. 07/149,923
Motor
Inventor:
Yoji Arita
Patented Case
View Patent ↗
Granted: Mar 14, 1989
Filed: Jan 29, 1988
Inventor
Yoji Arita
Assignees (at issue)
Mitsubishi Chemical Industries, Ltd.
MITSUBISHI STEEL MFG. CO., 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.