Granted Patent
Utility
US 4,718,121 · App. 06/836,795
Balanced coherent receiver
Inventor:
Richard E. Epworth
Patented Case
View Patent ↗
Granted: Jan 5, 1988
Filed: Mar 6, 1986
Inventor
Richard E. Epworth
Assignee (at issue)
STC PLC
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.