Granted Patent
Utility
US 4,655,678 · App. 06/704,384
Combined turbo-molecular pump
Inventor:
Masaharu Miki
Patented Case
View Patent ↗
Granted: Apr 7, 1987
Filed: Feb 22, 1985
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.