22 Utility Patents
#2,106 in Beijing
#5,086 in China
#147,548 in the World
Forward Citations = 79
Company Filing History:

Beijing Drainage Group Co., Ltd

4. 1 out of 4,282

5. 1 out of 1,464
Hefei Xinsheng Optoelectronics Technology Co., Ltd.
where one patent can have more than one assignee
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