Granted Patent
Utility
US 6,600,436 · App. 10/106,924
D/A converter having capacitances, tone voltage lines, first switches, second switches and third switches
Inventor:
Yukio Tanaka
Patented Case
View Patent ↗
Granted: Jul 29, 2003
Filed: Mar 25, 2002
Inventor
Yukio Tanaka
Assignee (at issue)
SEMICONDUCTOR ENERGY LABORATORY CO., 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.