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Wireless carriers sued over patents

AT&T Inc., Verizon Communications Inc. and Sprint Nextel Inc., the biggest U.S. wireless carriers, were sued by NTP Inc. over patent-infringement claims similar to those it made against the owner of the BlackBerry device. Closely held NTP, a technology-licensing company, claims AT&T, Verizon’s Verizon Wireless unit and Sprint are violating eight patents for e-mail services. They ...

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