Granted Patent
Utility
US 4,817,033 · App. 06/931,830
Signal detecting circuit
Inventor:
Kei Koya
Patented Case
View Patent ↗
Granted: Mar 28, 1989
Filed: Nov 18, 1986
Inventor
Kei Koya
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.