With the analysis among 181 patents, we discovered top 39 key players by total patent application. Sun Microsystems, Inc., Hitachi Ltd., British Telecommunications Plc are dominant in this area. They take 45.86% of the total patent filing.
California, United States
Patent: 46
Tokyo-to, Japan
Patent: 20
California, United States
Patent: 15
New York, United States
Patent: 7
California, United States
Patent: 4
Massachusetts, United States
Patent: 4
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