Mobile Satellite Ventures Acquires Celsat's Patent Portfolio

Acquisition of System Patents Solidifies MSV's Leadership Position in Hybrid Satellite-Terrestrial Services

Reston, Virginia, UNITED STATES

RESTON, Va., April 25, 2005 (PRIMEZONE) -- Mobile Satellite Ventures (MSV) announced today that it has acquired the entire patent portfolio of one of the original developers of the hybrid satellite-terrestrial system concept, Celsat, Inc. The Celsat patents include thirteen granted, and two additional pending, patents with issue dates as early as 1991. The Celsat patents further strengthen MSV's existing ATC patent portfolio in the areas of CDMA architecture and radio resource management. These patents join MSV's extensive and rapidly growing patent portfolio, including four omnibus patents of nearly 600 allowed claims. As previously announced, after years of invention and investment, MSV's comprehensive patent portfolio is emerging from the pipeline.

"With the addition of the Celsat patents, MSV's leadership role and strategic advantage is further solidified," said Peter D. Karabinis, chief technical officer of MSV. "For over 5 years, MSV has been building a portfolio of ATC-related intellectual property, by acquisition and by internal development. This portfolio includes almost 20 issued US patents, and almost 70 pending US patent applications directed to the space segment, the terrestrial segment and the wireless terminals of an ATC network. We believe our portfolio far eclipses any other potential ATC portfolio both in breadth and in depth."

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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