Granted Patent
Utility
US 6,315,517 · App. 09/426,530
Vacuum pump
Inventors:
Manabu Nonaka, Akira Yamauchi
Patented Case
View Patent ↗
Granted: Nov 13, 2001
Filed: Oct 26, 1999
Inventors
Manabu Nonaka
Akira Yamauchi
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.