JAPANESE PATENT OFFICE UPHELD 02MICRO'S PATENT NO.3,758,165

Date21-Sep-2009

GEORGE TOWN, Grand Cayman, Sept. 14, 2009 (GLOBE NEWSWIRE) -- O2Micro(R) International Limited (Nasdaq:OIIM - News) today announced that the Japanese Patent Office has upheld O2Micro's Patent No. 3,758,165 entitled "Sequential Burst Mode Activation Circuit."

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O2Micro's case was heard by the Intellectual Property High Court in Japan ("IP High Court"), a court specializing in intellectual property cases in Japan. The IP High Court ruled in O2Micro's favor. The Japanese Patent Office subsequently issued a decision upholding the validity of O2Micro's patent and that decision became final on August 29, 2009.

About O2Micro

Founded in April 1995, O2Micro develops and markets innovative power management, and security components for the Computer, Consumer, Industrial, and Communications markets. Products include Intelligent Lighting, Battery Management, Power Management, and SmartCardBus(R) products.

O2Micro International maintains an extensive portfolio of intellectual property with 12,700 patent claims granted, and over 15,000 more pending. The company maintains offices worldwide. Additional company and product information can be found on the company website at www.o2micro.com.

O2Micro, the O2Micro logo, SmartCardBus, and combinations thereof are registered trademarks of O2Micro. All other trademarks are the property of their respective owners.

The O2Micro International Limited logo is available at http://www.globenewswire.com/newsroom/prs/?pkgid=6567

Statements made in this release that are not historical, including statements regarding O2Micro's or management's intentions, hopes, beliefs, expectations, representations, projections, plans or predictions of the future, are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Such statements involve risks and uncertainties that may cause actual results to differ materially from those set forth in these statements. Factors that could cause actual results to differ materially include risks and uncertainties such as reduced demand for products of electronic equipment manufacturers which include O2Micro's products due to adverse economic conditions in general or specifically affecting O2Micro's markets, technical difficulties and delays in the developments process, and errors in the products. You are also referred to the Form F-1 in connection with the company's initial public offering in August 2000, Form F-3 in connection with the company's public offering in November 2001, and the annual reports on Form 20-F, which identify important risk factors that could cause actual results to differ from those contained in the forward-looking statements. The company assumes no obligation to update or revise any forward-looking information, whether as a result of new information, future events or otherwise.

Contact:

O2Micro International Limited
Gary E. Abbott, Director of Investor Relations
408.987.5920, x8888
gary.abbott@o2micro.com