Ruud Lighting, a Cree company, has extended its legal dispute with Cooper Lighting by filing another patent-infringement lawsuit against Cooper Lighting in the US District Court for the Eastern District of Wisconsin.

Filed in late May, the latest lawsuit seeks a permanent injunction and monetary damages for infringement of US patent no. 7,952,262.

The ‘262 patent is entitled “Modular LED Unit Incorporating Interconnected Heat Sinks Configured to Mount and Hold Adjacent LED Modules.” It was filed in September 2007 and granted on May 31, 2011.

The patent covers a modular LED unit with a number of LED modules separately mounted on individual heat sinks, where the heat-sink fins have interlocking features to enable the modules to be interconnected.

In its complaint, Ruud claims that Cooper sells “a product known as its Generation Series LED Post Top Luminaire, which infringes the ‘262 patent.”

Ruud says that it has “manufactured and sold numerous LED products based on the inventions of the ‘262 patent for roadway-, area- and street-lighting applications, including certain of Ruud’s The Edge LED Floodlight products…The Ruud LED products based on the inventions of the ‘262 patents have enjoyed tremendous commercial success.”