Granted Patent
Utility
US 5,013,987 · App. 07/381,506
Control system for magnetic bearing
Inventor:
Shinji Wakui
Patented Case
View Patent ↗
Granted: May 7, 1991
Filed: Jul 18, 1989
Inventor
Shinji Wakui
Assignee (at issue)
SEIKO INSTRUMENTS INC.
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.