Granted Patent
Utility
US 5,588,053 · App. 08/585,530
DTMF detector system and method which performs static and dynamic thresholding
Inventor:
Zheng Xie
Patented Case
View Patent ↗
Granted: Dec 24, 1996
Filed: Jan 11, 1996
Inventor
Zheng Xie
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.