Granted Patent
Utility
US 4,507,721 · App. 06/515,754
DC-DC Converter for remote power feeding
Inventors:
Seiichi Yamano, Haruo Ogiwara
Patented Case
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Granted: Mar 26, 1985
Filed: Jul 21, 1983
Inventors
Seiichi Yamano
Haruo Ogiwara
Assignee (at issue)
Nippon Telegraph and Telephone Public 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.