Granted Patent
Utility
US 6,559,568 · App. 10/068,833
Magnetic bearing type vacuum pump
Inventors:
Yasushi Maejima, Masayoshi Takamine
Patented Case
View Patent ↗
Granted: May 6, 2003
Filed: Feb 6, 2002
Inventors
Yasushi Maejima
Masayoshi Takamine
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.