USPTO Affirms Key MMP Portfolio(TM) Patents After Multiple Reexams

CARLSBAD, Calif. -- Sept. 16, 2009 -- Patriot Scientific Corporation (OTC Bulletin Board: PTSC - News) announced today that the United States Patent and Trademark Office (USPTO) has affirmed the validity of US'336, the most widely recognized patent in the MMP Portfolio(TM).

Recent decisions regarding the Company's MMP Portfolio, licensed by more than 60 global manufacturers, significantly strengthen the patents and its licensing effort exclusively conducted by The TPL Group.

Recent key developments include:

• August - September 2009. The USPTO indicates it will issue a Reexamination Certificate for the US'336 "Dual Asynchronous Clock" patent, ending reexaminations filed by NEC, Toshiba, and the Public Patent Foundation; while rejecting another attempted attack by litigant HTC.

• July 2009. The USPTO issues a Reexamination Certificate for the US'584 "Multiple Instruction Fetch" patent over the reexaminations filed by litigants NEC and Toshiba.

• January 2009. The German Patent Court confirms the validity of MMP Portfolio patent EP'730 rejecting a "nullity action" brought by Deutsche Telecom.

Combined with favorable "Markman" Rulings in the Eastern District of Texas in 2007 and the steady addition of new licensees since the launch of the Licensing Program in 2005, the MMP Portfolio continues to represent one of the most important electronic patent portfolios.

"We are pleased that the US Patent Office action has strengthened the MMP Patent Portfolio," said Rick Goerner, Patriot's President/CEO. "This outcome represents an extremely positive development and which we believe will significantly strengthen the MMP Portfolio(TM) Licensing Program moving forward."

About the MMP Portfolio

The Moore Microprocessor Patent Portfolio contains intellectual property that is jointly owned by the privately-held TPL Group and publicly-held Patriot Scientific Corporation (OTCBB: PTSC - News). The MMP Portfolio includes seven U.S. patents as well as their European and Japanese counterparts. It is widely recognized that the MMP Portfolio protects fundamental technology used in microprocessors, microcontrollers, digital signal processors (DSPs), embedded processors and system-on-chip (SoC) devices. Manufacturers of microprocessor-based products can learn more about how to participate in the MMP Portfolio Licensing Program by contacting: mmp-licensing@alliacense.com.

About Patriot Scientific

Headquartered in Carlsbad, California, Patriot Scientific Corporation provides data sharing and secure data solutions for a connected world. Patriot Scientific addresses the expanding market opportunities in the healthcare, justice and public safety industries through its wholly owned subsidiary Patriot Data Solutions Group, Inc. These growth activities are funded with revenues generated, in a large part, from the continuing successful Moore Microprocessor Patent(TM) Portfolio licensing partnership with The TPL Group. Patriot Scientific's integrated core intelligence solution addresses the critical data/information sharing needs of the healthcare industry, the Department of Homeland Security, the Department of Justice, and federal, state, and local public safety and law enforcement agencies. For more information on Patriot Scientific Corporation, visit: www.ptsc.com.