Granted Patent
Utility
US 4,742,316 · App. 07/037,765
Pulse-width modulator
Inventor:
Thomas Riedger
Patented Case
View Patent ↗
Granted: May 3, 1988
Filed: Apr 13, 1987
Inventor
Thomas Riedger
Assignee (at issue)
U.S. Philips Corporation
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.