Granted Patent
Utility
US 6,835,263 · App. 10/113,934
Method of producing a tube-shaped torsion-proof and bending-resistant drive shaft
Inventors:
Anton Bergmann, Marinus Sedlmeier
Patented Case
View Patent ↗
Granted: Dec 28, 2004
Filed: Apr 2, 2002
Inventors
Anton Bergmann
Marinus Sedlmeier
Assignee (at issue)
Eurocopter Deutschland 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.