Granted Patent
Utility
US 4,424,557 · App. 06/334,843
Full bridge PWM inverter with distributed device switching
Inventor:
Robert Louis Steigerwald
Patented Case
View Patent ↗
Granted: Jan 3, 1984
Filed: Dec 28, 1981
Inventor
Robert Louis Steigerwald
Assignee (at issue)
General Electric Company
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.