Sixth Comprehensive Patent Issued to Mobile Satellite Ventures

Patent Claims Now in Excess of 800 for Hybrid Satellite Terrestrial Technology

RESTON, Va., May 18, 2005 (PRIMEZONE) -- Mobile Satellite Ventures (MSV) announced today the grant of another comprehensive patent for fundamental aspects of its ancillary terrestrial component (ATC) technology. This patent, the 6th in a series of wide-ranging patents, covers systems and methods for coordinating space-based and terrestrial use of satellite frequencies for a satellite/terrestrial hybrid network. The patent covers both band segmentation and/or frequency reuse between the two components of the hybrid network. This recent ATC patent issued to MSV, Coordinated Satellite-Terrestrial Frequency Reuse (US Patent 6,892,068), has 149 claims which brings the total number of claims for MSV patents to over 800.

"MSV is without question the technology leader in the mobile satellite business. Through the hard work of our great engineers, MSV is setting the technical standards for the next generation of wireless mobile systems that combine the best of satellites and terrestrial systems," says Alexander H. Good, vice chairman and chief executive officer at MSV. "Our intellectual property portfolio will continue to grow as the additional 70 pending U.S. patent applications regarding all aspects of ATC networks including space segment, terrestrial segment and wireless terminals are issued."

About Mobile Satellite Ventures

Mobile Satellite Ventures is developing the next generation hybrid wireless network that will use a powerful satellite constellation working in unison with MSV's patented ancillary terrestrial component (ATC) technology to deliver seamless wireless services to end-users over standard wireless devices.

MSV is North America's premier provider of mobile satellite communications. Delivering service since 1996, MSV offers customers a wide choice of wireless data, voice, fax and dispatch radio services via its two MSAT satellites. MSV provides superior capacity and reliability for customers across North America, northern South America, Central America, the Caribbean, Hawaii and in coastal waters.

The MSV investor group includes Motient Corporation (Pink Sheets:MNCP), SkyTerra Communications (OTCBB:SKYT), TMI Communications, Columbia Capital, and Spectrum Equity Investors

MSV has offices in Reston, Va., and Ottawa, On. For more information, visit MSV online at


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