Granted Patent
Utility
US 5,977,761 · App. 09/182,872
Three-phase transformer with in phase regulating winding for the regulation of phase voltages
Inventors:
Helmut Bilger, Jean-François Ravot
Patented Case
View Patent ↗
Granted: Nov 2, 1999
Filed: Oct 30, 1998
Inventors
Helmut Bilger
Jean-François Ravot
Assignee (at issue)
Asea Brown Boveri, S.A.
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.