With the analysis among 67 patents, we discovered top 26 key players by total patent application. Procter & Gamble Co., Koninklijke Philips NV, Nippon Telegraph & Telephone Corp. are dominant in this area. They take 52.24% of the total patent filing.
Ohio, United States
Patent: 28
Noord-Holland, Netherlands
Patent: 4
New York, United States
Patent: 1
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