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USPTO Data Jan 1 1976 - Oct 20 2026
2 Patents
#877 in Beijing
#11,632 in China
Charna Chemicals Ltd.
Forward Citations = 0
5 inventors:
Charna Chemicals Ltd.
% Expired Patents = 100.0
Forward Citations = 0
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5 inventors (with patents filed for the assignee):
Wei Zhang (2 out of 304 patents)
Yali Zhang (2 out of 21 patents)
Mingjian Qiu (2 out of 2 patents)
4. Zhaohui Chen (2 out of 3 patents)
5. Chunshan Zhang (2 out of 2 patents)
2 patents:
IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Charna Chemicals Ltd.. Retrieved from https://idiyas.com/company/charna-chemicals
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]