Granted Patent
Utility
US 6,419,461 · App. 09/882,159
Turbo molecular pump
Inventor:
Takashi Okada
Patented Case
View Patent ↗
Granted: Jul 16, 2002
Filed: Jun 15, 2001
Inventor
Takashi Okada
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.