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(Updates with additional background on other lawsuits and smartphone competition.) By Roger Cheng Of DOW JONES NEWSWIRES NEW YORK (Dow Jones)--NTP Inc., best-known for getting a settlement from Research In Motion Ltd. (RIMM, RIM.T) over email technology, is shifting its legal sights to a number of smartphone makers including Apple Inc. (AAPL) and Google Inc. (GOOG). NTP, which holds a number of patents but doesn't manufacture any products, filed a lawsuit on Thursday in the U.S. District Court in the Eastern District of Virginia against Apple, Google, HTC Corp. (HTCXF, 2498.TW), LG Electronics Inc. (066570.SE), Microsoft Corp. (MSFT) and Motorola Inc. (MOT) over eight patents related to the wireless delivery of email. Legal tactics have increasingly become common among technology players looking to defend their turf, intimidate competitors, or extract an additional revenue stream through a forced licensing agreement. NTP has precedence--Research In Motion paid the company $612.5 million in a settlement to prevent a potential injunction of its popular Blackberry smartphones--which makes it a legitimate threat to other smartphone makers. "Use of NTP's intellectual property without a license is just plain unfair to NTP and its licensees," company co-founder Donald E. Stout said in a statement. "We took the necessary action to protect our intellectual property." NTP was co-founded by Tom Campana, who the company calls "the inventor of wireless email." Spokesmen for the various sued companies weren't immediately available for comment. NTP has also launched patent-infringement suits against wireless providers such as AT&T Inc. (T), Deutsche Telekom AG's (DTEGY, DTE.XE) T-Mobile USA, Sprint Nextel Corp. (S), and Verizon Communications Inc. (VZ) and Vodafone Group PLC's (VOD, VOD.LN) Verizon Wireless. The increasing amount of jockeying for position among smartphone manufacturers has created fertile ground for courtroom clashes. Last month, Apple filed a second complaint against HTC over software and technology for mobile devices after HTC launched a countersuit, embroiling the two deeper into their legal spat. RIM and Motorola recently settled a patent dispute, with RIM agreeing to a one-time payment and ongoing royalties to Motorola. At the same time, the pace of smartphone launches has accelerated. On the heels of the launch of the iPhone 4, a new Motorola Droid phone and a line of Galaxy S smartphones from Samsung Electronics Co. (SSNHY, 005930.SE) are expected in the coming weeks. -By Roger Cheng, Dow Jones Newswires; 212-416-2153; roger.cheng@dowjones.com (Nathan Becker contributed to this article.) (END) Dow Jones Newswires July 09, 2010 09:52 ET (13:52 GMT)