Granted Patent
Utility
US 5,343,476 · App. 08/148,017
Transmission system for the synchronous digital hierarchy
Inventor:
Ralph Urbansky
Patented Case
View Patent ↗
Granted: Aug 30, 1994
Filed: Nov 5, 1993
Inventor
Ralph Urbansky
Assignee (at issue)
U.S. Philips Corporation
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.