VirnetX Announces Denial of Three Microsoft Petitions for Inter Partes Review

VirnetX™ Holding Corporation (NYSE MKT: VHC), an Internet security software and technology company, announced today that last week, the United States Patent and Trademark Office (USPTO) denied three petitions for inter partes review (IPR) filed by Microsoft. These petitions sought review of certain claims of VirnetX’s U.S. Patent Nos. 6,502,135 (‘135 patent) and 7,188,180 (‘180 patent). Like some of the petitions filed by Apple and all of the petitions filed by RPX, the USPTO found that Microsoft’s petitions were not filed within the time limit imposed by the statute and declined to institute inter partes review. Microsoft was found to infringe both ‘135 and ‘180 patents in a prior lawsuit filed by VirnetX against Microsoft.

“We are pleased with the USPTO’s decisions denying Microsoft’s petitions,” said Kendall Larsen, VirnetX CEO and President. “With these latest decisions, the USPTO has now either declined to institute review or terminated 21 inter partes review proceedings that were filed by New Bay, Apple, RPX, or Microsoft.”

About VirnetX

VirnetX Holding Corporation is an Internet security software and technology company with patented technology for secure communications including 4G LTE security. The Company’s software and technology solutions, including its secure domain name registry and GABRIEL Connection Technology™, are designed to facilitate secure communications and to create a secure environment for real-time communication applications such as instant messaging, VoIP, smart phones, eReaders and video conferencing. The Company’s patent portfolio includes over 80 U.S. and international patents with over 100 pending applications. For more information, please visit