IP Library › Granted Patent US 6,771,751
Granted Patent Utility
US 6,771,751 · Confirmation No. 7800

SYSTEMS AND METHODS FOR INFORMATION EXCHANGE AND SYNCHRONIZATION USING DTMF OVER TELEPHONE COMMUNICATION CHANNELS

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Quick Facts
Patent No.
US 6,771,751
App. No.
10/033,372
Filed
2001-10-17
Granted
2004-08-03
Examiner
CHAN, WING F
Art Unit
2643
PTA
-207 days