The U.S. International Trade Commission has banned the import of certain 3D movie-projection systems that it found to have violated the patents of RealD, one of the leading providers of 3D systems. The Beverly Hills-based RealD has been in a long-running patent-infringement dispute with Sherman Oaks-based Masterimage 3D and Masterimage 3D Asia, based in South Korea.

In its ruling (read it here), the commission determined the appropriate remedy is a limited exclusion order prohibiting the importation of certain 3D cinema systems and components that infringe on three of RealD’s patents. It also issued a cease and desist order against MasterImage.

“RealD invented today’s modern 3-D cinema technology and has invested significant resources to perfect the 3-D experience,” said RealD CEO Michael V. Lewis. “The company is gratified that the USITC recognized RealD’s innovation.”

RealD says that 28,000 theaters around the world are equipped with its 3D projection technology. The company was taken private in November after private equity investor Rizvi Traverse Management agreed to pay $551 million, including assumption of debt.