Rambus Reaches 400th Issued Patent Milestone; Total Issued and Pending Patents Exceed 800

LOS ALTOS, Calif.--(BUSINESS WIRE)--May 26, 2005 -- Rambus Inc. (Nasdaq:RMBS), one of the world's premier technology licensing companies specializing in high-speed chip interfaces, today announced that it has reached 400 issued patents from the U.S. Patent and Trademark Office, and foreign patent offices. Rambus's patent portfolio covers fundamental inventions made in the area of high-speed signaling including those underlying all modern DRAM memory products.

Rambus is a leading developer of technologies and solutions addressing today's challenging chip interface designs. Since its founding in 1990, Rambus has focused on advancing system performance through innovations in logic and memory interfaces, controller architecture, high-speed parallel and serial links, and advanced system design. The result is a broad portfolio of innovations that enables semiconductor manufacturers and system designers to achieve the highest levels of performance -- providing consumers with products delivering life-like digital images, seamless connectivity and blazingly fast operating speeds. Further, Rambus's innovations allow its customers to lower system costs, mitigate risk, and reduce time to market through silicon-proven designs.

"Rambus has a rich history of designing and developing some of the world's most advanced signaling technologies," said Kent Richardson, vice president of Intellectual Property at Rambus. "It is rewarding to reach this milestone which recognizes the superior research and development work and industry contributions made by our Rambus engineering team."

To date, Rambus interface innovations have been incorporated into virtually all personal computers and into many other high-volume applications in computing, communications, and consumer electronics, such as servers, workstations, printers, routers, switches, video projectors, digital TVs, set-top boxes and video game consoles. As signaling speeds continue to increase, Rambus innovations will become increasingly critical in the implementation of other interfaces such as advanced serial link architectures and high-speed parallel interfaces.

Rambus now has 400 issued and 421 pending patents. For more information on Rambus's patent portfolio, visit www.rambus.com/products/innovationslicensing/.

About Rambus Inc.

Rambus is one of the world's premier technology licensing companies specializing in the invention and design of high-speed chip interfaces. Since its founding in 1990, the company's innovations, breakthrough technologies and integration expertise have helped industry-leading chip and system companies solve their most challenging and complex I/O problems and bring their products to market. Rambus's interface solutions can be found in numerous computing, consumer, and communications products and applications. Rambus is headquartered in Los Altos, Calif., with regional offices in Chapel Hill, North Carolina; Bangalore, India; Taipei, Taiwan; and Tokyo, Japan. Additional information is available at www.rambus.com.