Granted Patent
Utility
US 6,679,394 · App. 10/168,923
Ring lift crane
Inventors:
Eberhard Schuffert, Rüdiger Zollondz
Patented Case
View Patent ↗
Granted: Jan 20, 2004
Filed: Jun 24, 2002
Inventors
Eberhard Schuffert
Rüdiger Zollondz
Assignee (at issue)
Demag Mobile Cranes 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.