Granted Patent
Utility
US 6,563,411 · App. 09/787,296
Current transformer with direct current tolerance
Inventors:
Detlef Otte, Joerg Petzold
Patented Case
View Patent ↗
Granted: May 13, 2003
Filed: May 4, 2001
Inventors
Detlef Otte
Joerg Petzold
Assignee (at issue)
Vacuumschmelze GmbH & Co. KG
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.