Granted Patent
Utility
US 5,896,378 · App. 08/682,499
SDH Add/Drop Multiplexer
Inventor:
Andrew Barker
Patented Case
View Patent ↗
Granted: Apr 20, 1999
Filed: Nov 7, 1996
Inventor
Andrew Barker
Assignee (at issue)
GPT Limited
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.