Granted Patent
Utility
US 6,661,680 · App. 10/010,417
Higher harmonic suppressor element and DC power supply unit using the same
Inventor:
Kazutoshi Maruoka
Patented Case
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Granted: Dec 9, 2003
Filed: Dec 6, 2001
Inventor
Kazutoshi Maruoka
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.