Granted Patent
Utility
US 6,594,157 · App. 09/809,366
Low-loss magnetic powder core, and switching power supply, active filter, filter, and amplifying device using the same
Inventors:
Shoji Yoshida, Hidetaka Kenmotsu, Takao Mizushima, Kazuaki Ikarashi, Yutaka Naito
Patented Case
View Patent ↗
Granted: Jul 15, 2003
Filed: Mar 15, 2001
Inventors
Shoji Yoshida
Hidetaka Kenmotsu
Takao Mizushima
Kazuaki Ikarashi
Yutaka Naito
Assignee (at issue)
ALPS ELECTRIC CO., LTD.
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.