Sunnyvale, CA – December 8, 2010 – Unidym, Inc., a majority owned subsidiary of Arrowhead Research Corporation (NASDAQ: ARWR), announced today that it has completed IP cooperation and license agreements with Samsung Electronics Co., Ltd. ("Samsung"). Under the agreements:

1. Unidym licensed to Samsung patents covering CNT materials, including fundamental patents on CNT compositions of matter, synthesis of CNTs, processing of CNTs, ink formulations, and transparent conductive films.

2. Unidym transferred certain patent rights to Samsung, primarily related to electronic devices incorporating CNTs. Samsung granted back to Unidym licenses to sell products under the transferred patent rights.

3. Unidym and Samsung will continue to work together to develop and commercialize CNT-based products.

"This is an important development in carbon-based electronics," said Mark Tilley, President and CEO of Unidym. "We have worked with Samsung Electronics for several years, and we are now looking forward to this next phase in our relationship. We expect Samsung’s investment in this alliance and ongoing IP cooperation with Unidym will open the market for printable carbon electronics."

About Samsung Electronics Co., Ltd.

Samsung Electronics Co., Ltd. is a global leader in semiconductor, telecommunication, digital media and digital convergence technologies with 2009 consolidated sales of US$116.8 billion. Employing approximately 174,000 people in 193 offices across 66 countries, the company consists of eight independently operated business units: Visual Display, Mobile Communications, Telecommunication Systems, Digital Appliances, IT Solutions, Digital Imaging, Semiconductor and LCD. Recognized as one of the fastest growing global brands, Samsung Electronics is a leading producer of digital TVs, memory chips, mobile phones and TFT-LCDs. For more information, please visit www.samsung.com <http://www.samsung.com> .

About Unidym, Inc.

Unidym is a leader in carbon nanotube-based transparent, conductive films (TCFs) for the electronics industry. TCFs are a critical component in devices such as touch panels, displays, and thin-film solar cells. For example, both touch panels and LCDs typically employ two TCF layers per device. Unidym’s TCFs offer substantial advantages over the incumbent technology, indium-based metal oxides, including: improved durability, lower processing costs, and lower overall cost structure. For more information, visit: http://www.unidym.com <http://www.unidym.com> .