Give you a ranking of patent agencies in 21:
Patent application business
First Group
Patent and Trademark Office of China Council for the Promotion of International Trade
China Patent Agency (Hongkong) Co., Ltd.
Zhongke Patent and Trademark Agency Co., Ltd.
Beijing Liushen Law Firm
Second Group
Beijing Sanyou Intellectual Property Agency Co., Ltd. Beijing Kangxin Intellectual Property Agency Co., Ltd.
Yongxin Patent and Trademark Agency Co., Ltd.
Shanghai Patent and Trademark Office Co., Ltd.
Beijing Unitalen Intellectual Property Agency Co., Ltd.
Beijing Zhongzi Law Firm
Third Group
Beijing Deqi Intellectual Property Agency Co., Ltd.
Beijing Dongfang Yisi Intellectual Property Agency Co., Ltd.
Beijing Jindu Law Firm
Beijing Beixiang. P > the fourth group
Beijing Bangxinyang Trademark Agency Co., Ltd.
Zhucheng Law Firm
Beijing Yinlong Intellectual Property Agency Co., Ltd.
Fangda Law Firm
Beijing Gecheng Intellectual Property Agency Co., Ltd.
Jinque Law Firm
Haotianxin Law Firm
Beijing Jikai Intellectual Property Agency Co., Ltd.
Longtian International Intellectual Property Agency Co., Ltd.
Fifth Group
Beijing Tongda Xinheng Intellectual Property Agency Co., Ltd.
Beijing Zhongboshida Patent and Trademark Agency Co., Ltd.
China Trademark Patent Office Co., Ltd.
Beijing Yingsai Jiahua Intellectual Property Agency Co., Ltd.
Beijing Tianhao United Intellectual Property Agency Co., Ltd.
Beijing Wanhuida Intellectual Property Agency Co., Ltd.
Patent litigation business
First Group < Jingliushen Law Firm
Beijing Zhongzi Law Firm
Second Group
China Council for the Promotion of International Trade Patent and Trademark Office
Zhongke Patent and Trademark Agency Co., Ltd.
Zhongyuan Xinda Intellectual Property Agency Co., Ltd.
Third Group
Beijing Anlun Law Firm
China Patent Agency (Hong Kong) Co., Ltd.
Fonda Law Firm
. > liande law firm
yongxin patent and trademark agency co., ltd.
huacheng law firm
Beijing zhengjian yongshen law firm
the fourth group
Beijing sanyou intellectual property agency co., ltd.
Zhucheng law firm
Beijing deqi intellectual property agency co., ltd.
Beijing yinlong intellectual property agency co., ltd.
jinque law firm
. Limited company
Cube Law Firm
Beijing Fanhua Weiye Intellectual Property Agency Co., Ltd.
Beijing Beixiang Intellectual Property Agency Co., Ltd.
Shanghai Patent and Trademark Office Co., Ltd.
Beijing Unitalen Intellectual Property Agency Co., Ltd.
Fifth Group
Beijing Bangxinyang Trademark Agency Co., Ltd.
Beijing Gecheng Intellectual Property Agency Co., Ltd.
Beijing Yingsai Jiahua Intellectual Property Agency Co., Ltd.