Granted Patent
Utility
US 4,932,735 · App. 07/414,980
Integrated optical hybrid matrix switches with very low crosstalk
Inventor:
Kwang-Tsai Koai
Patented Case
View Patent ↗
Granted: Jun 12, 1990
Filed: Sep 29, 1989
Inventor
Kwang-Tsai Koai
Assignee (at issue)
GTE Laboratories Incorporated
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.