BlackBerry maker Research in Motion Ltd. will take court action against NTP after hitting an impasse in finalizing a patent dispute settlement, reopening a legal battle investors had been told was wrapped up. The Canadian company agreed in March to pay $450 million to end the long-running patent dispute with closely held NTP, a U.S.-based patent holding company in return for the right to continue its BlackBerry-related business without further interference from NTP or its patents.