Granted Patent
Utility
US 6,364,604 · App. 09/347,355
Vacuum pump and vacuum apparatus equipped with vacuum pump
Inventors:
Manabu Nonaka, Takashi Okada
Patented Case
View Patent ↗
Granted: Apr 2, 2002
Filed: Jul 6, 1999
Inventors
Manabu Nonaka
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.