Granted Patent
Utility
US 4,645,413 · App. 06/610,333
Friction pump
Inventor:
Gunter Reich
Patented Case
View Patent ↗
Granted: Feb 24, 1987
Filed: May 15, 1984
Inventor
Gunter Reich
Assignee (at issue)
Leybold-Heraeus GmbH
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.