On February 17, 2011, Streamlight, Inc., a manufacturer of lighting products, filed a patent infringement suit in the U.S. District Court for the Eastern District of Pennsylvania against a competitor, Longhorn Tactical, LLC. Four patents were alleged to be infringed, including U.S. Patent Nos. 7,188,978 and 7,614,760; and U.S. Design Patent Nos. D543,446 and D548,385. Each of the four patents covers different utility or design components of a mountable light for a firearm rail system. The court case number is 2:11-cv-01152-AB.

(Source: RFC Express)