Granted Patent
Utility
US 6,535,000 · App. 09/921,173
Method and apparatus for determining the internal impedance of a distribution transformer and sensing DC current through an AC power meter
Inventor:
Kenneth C. Shuey
Patented Case
View Patent ↗
Granted: Mar 18, 2003
Filed: Aug 2, 2001
Inventor
Kenneth C. Shuey
Assignee (at issue)
ABB 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.