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USPTO Data Jan 1 1976 - Oct 27 2026
1 Patents
#1,318 in Beijing
#18,836 in China
China Nil Research Center for Proficiency Testing
Forward Citations = 0
4 inventors:
China Nil Research Center for Proficiency Testing
Calculating rank
Forward Citations = 0
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4 inventors (with patents filed for the assignee):
Liang Zhang (1 out of 128 patents)
Haizhou Wang (1 out of 19 patents)
Yongyan Chen (1 out of 1 patent)
4. Lingtian Tang (1 out of 1 patent)
1 patent:
IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: China Nil Research Center for Proficiency Testing. Retrieved from https://idiyas.com/company/china-nil-research-center-for-proficiency-testing
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile
Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]