Granted Patent
Utility
US 6,621,253 · App. 10/116,887
Amplifier having a variable power factor
Inventor:
Eric Mendenhall
Patented Case
View Patent ↗
Granted: Sep 16, 2003
Filed: Apr 5, 2002
Inventor
Eric Mendenhall
Assignee (at issue)
Gibson Guitar Corp.
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.