Granted Patent
Utility
US 4,456,997 · App. 06/301,670
Facility for fail-safe data transmission between trackside equipment of a guideway and vehicles moving therealong
Inventor:
Dieter Spitza
Patented Case
View Patent ↗
Granted: Jun 26, 1984
Filed: Sep 14, 1981
Inventor
Dieter Spitza
Assignee (at issue)
International Standard Electric Corporation
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.