Granted Patent
Utility
US 6,421,382 · App. 09/605,384
Pulse width modulation signal generator
Inventor:
Kazuyoshi Hayakawa
Patented Case
View Patent ↗
Granted: Jul 16, 2002
Filed: Jun 28, 2000
Inventor
Kazuyoshi Hayakawa
Assignee (at issue)
NEC 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.