Granted Patent
Utility
US 5,274,289 · App. 07/826,819
Butting ring for a rotor shaft
Inventor:
Gunter Wrobel
Patented Case
View Patent ↗
Granted: Dec 28, 1993
Filed: Jan 28, 1992
Inventor
Gunter Wrobel
Assignee (at issue)
Papst Motoren GmbH & Co KG
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.