BEIJING, Aug 13 (Reuters) - Beijing E-Town Semiconductor

Technologies, a semiconductor equipment firm backed

by Beijing's government, on Wednesday said it has sued U.S. chip

equipment supplier Applied Materials ( AMAT ) over alleged trade

secrets infringement.

Applied Materials ( AMAT ) had illegally obtained and used Beijing

E-Town's core technology secrets related to plasma sources and

wafer surface treatment, the Beijing-based company said

according to a filing on the Shanghai Stock Exchange.

The company alleged that Applied Materials ( AMAT ) had disclosed

technical secrets by applying for a patent in China and claiming

the patent's application rights.

Applied Materials ( AMAT ) did not immediately respond to a request

for comment.