Granted Patent
Utility
US 6,553,111 · App. 09/416,950
Synchronous digital hierarchy switch system
Inventor:
Chu WANG
Patented Case
View Patent ↗
Granted: Apr 22, 2003
Filed: Oct 13, 1999
Inventor
Chu WANG
Assignee (at issue)
3C
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.