Granted Patent
Utility
US 4,425,641 · App. 06/276,494
Time division multiplex telecommunication digital switching modules
Inventors:
Joseph A. French, Thomas S. Maddern, Alexander S. Philip
Patented Case
View Patent ↗
Granted: Jan 10, 1984
Filed: Jun 23, 1981
Inventors
Joseph A. French
Thomas S. Maddern
Alexander S. Philip
Assignee (at issue)
The Plessey Company 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.