Granted Patent
Utility
US 5,898,556 · App. 08/825,743
Protection system for a three-phase distribution transformer insulated in a liquid dielectric
Inventors:
Thomas de Sedouy, Philippe Folliot
Patented Case
View Patent ↗
Granted: Apr 27, 1999
Filed: Apr 3, 1997
Inventors
Thomas de Sedouy
Philippe Folliot
Assignee (at issue)
GEC Alsthom T&D 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.