Granted Patent
Utility
US 4,891,744 · App. 07/250,565
Power converter control circuit
Patented Case
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Granted: Jan 2, 1990
Filed: Sep 29, 1988
Assignee (at issue)
MITSUBISHI ELECTRIC 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.