Columbia University Professor Emeritus Gertrude Neumark Rothschild has filed a complaint against nearly 30 companies, including some of the largest electronic companies in the world. The complaint also asks authorities to block numerous commercial imports, to the United States, including Blu-ray disc players.

According to British Sky News, the products in question are claimed to “infringe Rothschild’s patents relating to short-wavelength light-emitting diodes and laser diodes - the latter which are found in some PDAs and HD DVD players.”

The complaint has now prompted an investigation by the US International Trade Commission.

Some of the nearly 30 companies named in the complaint include,  Nokia, Motorola, LG and Panasonic maker Matsushita Electric.

http://news.sky.com/skynews/xml/article/tech/0,,91221-13611,00.html