Granted Patent
Utility
US 5,889,424 · App. 08/018,836
Pulse width modulation operation circuit
Inventors:
Atsushi Iwata, Makoto Nagata
Patented Case
View Patent ↗
Granted: Mar 30, 1999
Filed: Feb 4, 1998
Inventors
Atsushi Iwata
Makoto Nagata
Assignee (at issue)
President of Hiroshima University
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.