Granted Patent
Utility
US 4,291,368 · App. 06/025,417
Pulse-width modulated inverter system and method
Inventors:
Raymond J. Yarema, George H. Studtmann
Patented Case
View Patent ↗
Granted: Sep 22, 1981
Filed: Mar 30, 1979
Inventors
Raymond J. Yarema
George H. Studtmann
Assignee (at issue)
BorgWarner Inc.
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.