Granted Patent
Utility
US 6,683,439 · App. 10/153,807
DC power source unit with battery charging function
Inventors:
Nobuhiro Takano, Takeshi Takeda, Eiji Nakayama, Kazuhiro Funabashi
Patented Case
View Patent ↗
Granted: Jan 27, 2004
Filed: May 24, 2002
Inventors
Nobuhiro Takano
Takeshi Takeda
Eiji Nakayama
Kazuhiro Funabashi
Assignee (at issue)
Hitachi Koki 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.