Granted Patent
Utility
US 4,878,813 · App. 07/165,719
Vacuum pump
Inventor:
Masaharu Miki
Patented Case
View Patent ↗
Granted: Nov 7, 1989
Filed: Mar 9, 1988
Inventor
Masaharu Miki
Assignee (at issue)
Seiko Seiki Kabushiki Kaisha
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.