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USPTO Data Jan 1 1976 - Oct 6 2026
1 Patents
#1,655 in London
#9,875 in United Kingdom
Calchan Limited
Forward Citations = 0
6 inventors:
Calchan Limited
% Expired Patents = 100.0
EPO Patents = 1
Forward Citations = 0
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6 inventors (with patents filed for the assignee):
David Witty (1 out of 10 patents)
Jason Tierney (1 out of 4 patents)
David Norton (1 out of 16 patents)
4. Ghislaine Lorthioir (1 out of 2 patents)
5. Mairi Sime (1 out of 2 patents)
6. Karen Louise Philpott (1 out of 2 patents)
7. Jason Paul Tierney (0 patent)
8. David R Witty (0 patent)
1 patent:
IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Calchan Limited. Retrieved from https://idiyas.com/company/calchan
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]
1 patent (EPO):
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]