Granted Patent
Utility
US 6,617,733 · App. 09/700,640
Magnetic bearing apparatus and vacuum pump having magnetic bearing apparatus
Inventors:
Akira Yamauchi, Manabu Nonaka
Patented Case
View Patent ↗
Granted: Sep 9, 2003
Filed: Dec 29, 2000
Inventors
Akira Yamauchi
Manabu Nonaka
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.