Granted Patent
Utility
US 6,683,948 · App. 09/634,915
Device for automatically identifying DTMF and FSK for caller ID
Inventor:
Meng Tsung Hsieh
Patented Case
View Patent ↗
Granted: Jan 27, 2004
Filed: Aug 9, 2000
Inventor
Meng Tsung Hsieh
Assignee (at issue)
SUNPLUS TECHNOLOGY CO., LTD.
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.