Granted Patent
Utility
US 6,469,647 · App. 09/913,519
High-precision D-A converter circuit
Inventors:
Norihide Kinugasa, Kenichi Tatehara
Patented Case
View Patent ↗
Granted: Oct 22, 2002
Filed: Aug 15, 2001
Inventors
Norihide Kinugasa
Kenichi Tatehara
Assignee (at issue)
SUMITOMO ELECTRIC INDUSTRIES, 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.