Granted Patent
Utility
US 6,580,276 · App. 09/939,344
Tap switch for frequency response and partial discharge measurement
Inventor:
Nagi Hilal
Patented Case
View Patent ↗
Granted: Jun 17, 2003
Filed: Aug 24, 2001
Inventor
Nagi Hilal
Assignee (at issue)
ABB TECHNOLOGY AG
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.