Granted Patent
Utility
US 6,219,417 · App. 08/870,893
Ring trip detection in a communication system
Inventor:
Yan Zhou
Patented Case
View Patent ↗
Granted: Apr 17, 2001
Filed: Jun 6, 1997
Inventor
Yan Zhou
Assignee (at issue)
Advanced Micro Devices, Inc.
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.