Sony, Matsushita, and Toshiba are among some 30 companies that will be facing an investigation by the United States International Trade Commission (USITC) on possible patent infringement issues.

According to a news release from the commission, the products involved in the investigation are short-wavelength LEDs and laser diodes used in hand-held mobile devices, instrument panels, billboards, traffic lights, high-def DVD players, Blu-ray disc players, and data storage devices.

The investigation comes after a complaint made by Hartsdale, NY, resident Gertrude Neumark Rothschild. Rothschild's complaint alleges that the aforementioned products infringe on a patent she owns. She is currently seeking to block the products' importation into the U.S.

Here's a full list of the companies identified by the USITC as respondents in the investigation:

• Avago Technologies of Singapore
• Bacol Optoelectonic Co. Ltd. of Taiwan
• Dominant Semiconductors Sdn. Bhd. of Malaysia
• Everlight Electronics Co., Ltd., of Taiwan
• Exceed Perseverance Electronic Ind. Co., Ltd., of China
• Guangzhou Hongli Opto-Electronic Co., Ltd., of China
• Harvatek Internaional Inc. of Taiwan
• Hitachi, Ltd., of Japan
• Kingbright Electronic Co., Ltd., of Taiwan
• LG Electronics of Korea
• Lite-On Technology Corp. of Taiwan
• Lucky Light Electronics Co., Ltd., of China
• Matsushita Electric Industrial Co., Ltd., of Japan
• Motorola, Inc., of Schaumburg, IL
• Nokia of Finland
• Opto Tech Corporation of Taiwan
• Pioneer Corporation of Japan
• Rohm Co., Ltd., of Japan
• Samsung Group of Korea
• Sanyo Electric Co., Ltd., of Japan
• Seoul Semiconductor Co., Ltd., of Korea
• Sharp Corporation of Japan
• Shenzhen Unilight Electronic Co., Ltd., of China
• Shinano Kenshi Co., Ltd., of Japan
• Sony Corporation of Japan
• Sony Ericsson Mobile Communications AB of Sweden
• Stanley Electric Co., Ltd., of Japan
• Toshiba Corporation of Japan
• Vishay Intertechnology, Inc., of Malvern, PA
• Yellow Stone Corporation of Taiwan