Sprint, AT&T, Verizon Sued Over Calling Card Patent

Law360, Los Angeles (December 7, 2011, 6:50 PM EST) -- Sprint Nextel Corp., AT&T Inc. and Verizon Communications Inc. were accused Wednesday in Pennsylvania of infringing a patent related to the use of prepaid calling cards.

The suit, filed by inventor John R. Gammino, argues that the patent-in-suit is infringed when customers place phone calls using prepaid calling cards. The invention at issue provides telecommunications companies with a tool to selectively block and transmit international calls, the suit says.

Gammino claims his invention eliminated billions of dollars worth of potential losses by eradicating certain types of...
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