ExcelStor Technology, Inc., ExcelStor Technology, Ltd., ExcelStor Group Ltd., ExcelStor Great Wall Technology Ltd., and Shenzhen ExcelStor Technology Ltd. (collectively “ExcelStor” or “appellants”) appeal from the decision of the U.S. District Court for the Northern District of Illinois granting Papst Licensing GMBH & Co. KG’s motion to dismiss. ExcelStor Tech., Inc. v. Papst Licensing GMBH & Co. KG, No. 07-C2467, 2007 U.S. Dist. LEXIS 79305 (N.D. Ill. Oct. 24, 2007). Because the district court correctly concluded that it lacked subject matter jurisdiction over ExcelStor’s claims, we affirm.