Granted Patent
Utility
US 4,982,115 · App. 07/305,344
Digital signal direction detection circuit
Inventor:
Waitak P. Lee
Patented Case
View Patent ↗
Granted: Jan 1, 1991
Filed: Feb 2, 1989
Inventor
Waitak P. Lee
Assignee (at issue)
Rockwell International 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.