Granted Patent
Utility
US 5,093,754 · App. 07/421,179
Control system for a magnetic levitation body
Inventor:
Toshiaki Kawashima
Patented Case
View Patent ↗
Granted: Mar 3, 1992
Filed: Oct 13, 1989
Inventor
Toshiaki Kawashima
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.