Granted Patent
Utility
US 4,392,221 · App. 06/184,367
Time division multiplex module for use in digital switching network
Inventor:
Truman H. Hesketh
Patented Case
View Patent ↗
Granted: Jul 5, 1983
Filed: Sep 5, 1980
Inventor
Truman H. Hesketh
Assignee (at issue)
Plessey Overseas 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.