Granted Patent
Utility
US 6,774,537 · App. 10/260,842
Warning tone transmitter
Inventors:
Jens Titschert, Jorg Wagner, Emmanuel Charruau, Helmut Hermann
Patented Case
View Patent ↗
Granted: Aug 10, 2004
Filed: Sep 30, 2002
Inventors
Jens Titschert
Jorg Wagner
Emmanuel Charruau
Helmut Hermann
Assignee (at issue)
DBT Automation 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.