7 Utility Patents
#553 in Hangzhou
#19,166 in China
#598,480 in the World
Forward Citations = 0
Company Filing History:
Zhejiang Hengyi Petrochemical Co., Ltd.
Haining Hengyi New Materials Co., Ltd.
Fujian Yijin Chemical Fiber Co., Ltd.
where one patent can have more than one assignee
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