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The suit, filed in Virginia on Monday, seeks cash compensation. Donald Stout, co-founder of closely held NTP, said in a statement that the company sued after licensing talks failed. Palm shares tumbled following the announcement. The lawsuit may prove expensive and time-consuming for Palm management, based on the BlackBerry litigation. NTP sued RIM in 2001, claiming the BlackBerry e-mail devices infringed on NTP patents. After a trial, appeals and a failed initial settlement, the case was finally resolved in March when RIM agreed to pay NTP.