Granted Patent
Utility
US 4,888,558 · App. 07/263,107
Phase detector for amplitude modulated radio frequency signals containing a low frequency waveform
Inventor:
Earl C. Hereikson
Patented Case
View Patent ↗
Granted: Dec 19, 1989
Filed: Oct 26, 1988
Inventor
Earl C. Hereikson
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.