Granted Patent
Utility
US 6,028,422 · App. 09/284,713
Current transformer
Inventor:
Norbert Preusse
Patented Case
View Patent ↗
Granted: Feb 22, 2000
Filed: Apr 19, 1999
Inventor
Norbert Preusse
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.