Granted Patent
Utility
US 4,865,408 · App. 07/294,860
Low crosstalk reversed .DELTA..beta. electrodes for directional coupler switch
Inventor:
Steven K. Korotky
Patented Case
View Patent ↗
Granted: Sep 12, 1989
Filed: Jan 9, 1989
Inventor
Steven K. Korotky
Assignees (at issue)
American Telephone and Telegraph, Co.
AT&T Laboratories
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.