Granted Patent
Utility
US 5,886,889 · App. 08/921,011
Device and method for direct current power supply to a traction system by means of converters from different alternating current or direct current voltages
Inventor:
Didier Escallier
Patented Case
View Patent ↗
Granted: Mar 23, 1999
Filed: Aug 29, 1997
Inventor
Didier Escallier
Assignee (at issue)
GEC Alsthom Transport SA
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.