Granted Patent
Utility
US 6,169,509 · App. 09/337,554
Switched capacitor type D/A converter and display driver
Inventor:
Katsumi Abe
Patented Case
View Patent ↗
Granted: Jan 2, 2001
Filed: Jun 22, 1999
Inventor
Katsumi Abe
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.