With the analysis among 91 patents, we discovered top 29 key players by total patent application. International Business Machines Corp., Siemens AG, STC Plc are dominant in this area. They take 26.37% of the total patent filing.
International Business Machines Corp.
New York, United States
Patent: 10
Western Electric Co., Inc.
Georgia, United States
Patent: 7
Northern Illinois Gas Co.
Illinois, United States
Patent: 5
Noord-Holland, Netherlands
Patent: 3
Wisconsin, United States
Patent: 3
International Standard Electric Corp.
New York, United States
Patent: 3
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