Granted Patent
Utility
US 4,885,581 · App. 07/161,060
Digital-to-analog converter circuit
Inventors:
Mitsutoshi Sugawara, Nami Inamasu
Patented Case
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Granted: Dec 5, 1989
Filed: Feb 26, 1988
Inventors
Mitsutoshi Sugawara
Nami Inamasu
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.