Granted Patent
Utility
US 5,646,504 · App. 08/228,341
Magnetically balanced multi-output battery charging system
Inventor:
Robert Feldstein
Patented Case
View Patent ↗
Granted: Jul 8, 1997
Filed: Apr 15, 1994
Inventor
Robert Feldstein
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.