Granted Patent
Utility
US 6,637,348 · App. 10/188,358
Level-adjustable main spring and actively biased emergency spring with fail-safe behavior
Inventors:
Martin Teichmann, Herwig Waltensdorfer, Hans Hodl, Alexander Schimanofsky
Patented Case
View Patent ↗
Granted: Oct 28, 2003
Filed: Jul 2, 2002
Inventors
Martin Teichmann
Herwig Waltensdorfer
Hans Hodl
Alexander Schimanofsky
Assignee (at issue)
Siemens SGP Verkehrstechnik 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.