Granted Patent
Utility
US 4,561,837 · App. 06/150,034
Method of producing a rotor for rotary slide-vane vacuum pumps, and a rotor produced by said method
Inventors:
Hanns-Peter Berges, Hans-Peter Kabelitz
Patented Case
View Patent ↗
Granted: Dec 31, 1985
Filed: May 15, 1980
Inventors
Hanns-Peter Berges
Hans-Peter Kabelitz
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.