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U.S. Patent & Trademark Office Grants Tumbleweed A New Digital Certificate Patent

Redwood City, CA – Tumbleweed® Communications Corp. (NASDAQ:TMWD), a leading provider of email security, managed file transfer, and identity validation appliance and software products, announced that it has been granted U.S. Patent No. 7,073,056 by the U.S. Patent and Trademark Office.

The new patent, titled "Apparatus and Method for Demonstrating and Confirming the Status of Digital Certificates and Other Data” describes a method and apparatus for demonstrating and confirming the status of digital certificates and other data. The new patent is a continuation of U.S. Patent No. 6,532,540, which is itself a divisional of Patent No. 5,903,651, the application for which was filed on May 14, 1996.

Tumbleweed's patent portfolio includes 23 granted U.S. utility patents. The patent portfolio broadly covers secure communication over Internet standards.

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