China patent firms that work most with Japan firms

Ranked by patent family observations each China firm shares with Japan firms, 2013–2022. A family is counted once for each Japan firm it was shared with, so the same family can appear more than once. Later years are left out because many filings are not published yet.

#	Firm	Family observations with Japan firms	Japan firms
1	China Patent Agent (H.K.) Ltd.	25,191	438
2	NTD Patent & Trademark Agency Ltd.	23,243	408
3	Beijing Sanyou Intellectual Property Agency Ltd.北京三友知识产权代理有限公司	21,950	468
4	Liu Shen & Associates北京市柳沈律师事务所	21,441	480
5	China Science Patent & Trademark Agent Ltd.中科专利商标代理有限责任公司	19,266	481
6	Beijing Unitalen Intellectual Property Co., Ltd.集佳知识产权代理有限公司	18,794	511
7	Beijing Linda Liu Intellectual Property Agency Office (General Partnership)	18,790	506
8	CCPIT Patent and Trademark Law Office中国贸促会专利商标事务所	16,934	444
9	Shanghai Patent & Trademark Law Office, LLC.上海专利商标事务所有限公司	16,637	388
10	Beijing King & Wood Mallesons	13,819	337
11	China Sinda Intellectual Property Ltd.中原信达知识产权代理有限责任公司	12,540	373
12	BEIJING ZHONGZI LAW OFFICE	11,501	306
13	Beijing Kangxin Intellectual Property Agency Co., Ltd.北京康信知识产权代理有限责任公司	8,300	332
14	Dragon Intellectual Property Law Firm北京银龙知识产权代理有限公司	8,017	360
15	Tee & Howe Intellectual Property Attorneys	7,273	270
16	SHANGCHENG & PARTNERS	7,179	274
17	Lee and Li-Leaven IPR Agency Ltd.	6,923	199
18	Leader Patent & Trademark Firm	5,901	325
19	AFD China Intellectual Property Law Office北京安信方达知识产权代理有限公司	5,449	242
20	Lung Tin Intellectual Property Agent Ltd.	4,436	300
21	Beijing Beyond Patent Law Office	4,365	308
22	China PAT Intellectual Property Office	3,711	250
23	Shanghai Watson & Band Intellectual Property Agency Co., Ltd.	3,503	197
24	Beijing East IP Ltd.北京东方亿思知识产权代理有限责任公司	2,891	180
25	Lecome Intellectual Property Agent Ltd.	2,764	171

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