With the analysis among 33 patents, we discovered top 21 key players by total patent application. American Can Co., Pfizer Inc., Hoechst AG are dominant in this area. They take 21.21% of the total patent filing.
New York, United States
Patent: 2
New York, United States
Patent: 2
Wisconsin, United States
Patent: 2
Sichuan Sheng, China
Patent: 2
Noord-Holland, Netherlands
Patent: 2
Ohio, United States
Patent: 1
Georgia, United States
Patent: 1
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