Melbourne, Sep 29, 2010 (ABN Newswire) - Benitec Limited (ASX:BLT) (PINK:BNIKF), a leading Australian based company specialising in RNA interference (RNAi) technology, is pleased to announce that the US patent application for "RNAi Expression Constructs" has been successfully granted by the United States Patent and Trademark Office (USPTO) as US Patent No. 7,803,611.