Granted Patent
Utility
US 5,623,219 · App. 08/551,779
Maximal voltage three-phase PWM without third harmonic injection
Inventor:
Douglas Karraker
Patented Case
View Patent ↗
Granted: Apr 22, 1997
Filed: Nov 7, 1995
Inventor
Douglas Karraker
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.