Granted Patent
Utility
US 4,439,738 · App. 06/320,287
Class D pulse width modulated amplifier
Inventor:
Jay W. Atherton
Patented Case
View Patent ↗
Granted: Mar 27, 1984
Filed: Nov 12, 1981
Inventor
Jay W. Atherton
Assignee (at issue)
Honeywell Limited
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.