Granted Patent
Utility
US 4,908,620 · App. 07/305,383
Analog-to-digital and digital-to-analog converter
Inventor:
Akihiko FUJISAWA
Patented Case
View Patent ↗
Granted: Mar 13, 1990
Filed: Feb 1, 1989
Inventor
Akihiko FUJISAWA
Assignee (at issue)
OKI ELECTRIC INDUSTRY 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.