Granted Patent
Utility
US 5,886,880 · App. 08/084,909
Power circuit for transferring energy by alternately switching winding circuits of a transformer at high speed
Inventor:
Koji Hisanaga
Patented Case
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Granted: Mar 23, 1999
Filed: May 28, 1998
Inventor
Koji Hisanaga
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.