% Expired Patents = 50.0

EPO Patents = 1

Forward Citations = 45

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3 inventors (with patents filed for the assignee):

Martin Philip Riddiford (2 out of 123 patents)

Mark Lee Dempsey (1 out of 18 patents)

Abul Basher Khan (1 out of 1 patent)

4 patents: Sort by Forward Citations

1. 8050017 - Computer with a pen or touch sensitive display (2011-11-01),

2. 7355843 - Computer with a pen or touch sensitive display (2008-04-08),

3. 7127627 - Power management method and apparatus for use in electronic devices (2006-10-24),

4. 6812862 - Keyboard for an electronic device (2004-11-02),

Company Overview

Psion Digital Limited is a leading provider of rugged mobile computers and solutions for industrial and commercial use. With a focus on durability and reliability, we offer a range of products designed to withstand harsh environments and challenging conditions. Our innovative solutions help businesses improve efficiency, streamline processes, and enhance productivity in the field.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 13 2026

4 Patents

#657 in London

#3,869 in United Kingdom

London, United Kingdom

Psion Digital Limited

Forward Citations = 45

3 inventors:

Martin Philip Riddiford (2 out of 123 patents)

Mark Lee Dempsey (1 out of 18 patents)

Abul Basher Khan (1 out of 1 patent)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Psion Digital Limited. Retrieved from https://idiyas.com/company/psion-digital

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]

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]