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According to the formal complaint, TechRadium holds three patents significant to the way twitter operates.
The first (number 7,130,389) covers a "digital notification and response system;" the second (7,496,183) covers a "method for providing digital notification" and the third (7,519,165) for a "method for providing digital notification and receiving responses."
The essence of TechRadium's complaint is that many of the features of it's Immediate Response Information System (IRIS) product can be done for free by users of Twitter.