Granted Patent
Utility
US 6,696,821 · App. 10/345,352
DC-DC converter, duty-ratio setting circuit and electric appliance using them
Inventors:
Akira Haraguchi, Takashi Matsumoto, Kyuichi Takimoto
Patented Case
View Patent ↗
Granted: Feb 24, 2004
Filed: Jan 16, 2003
Inventors
Akira Haraguchi
Takashi Matsumoto
Kyuichi Takimoto
Assignee (at issue)
Fujitsu Limited
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.