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For the Inventor, By the Inventor

Portsmouth, United Kingdom

City Technology Limited


USPTO Granted Patents = 30

% Expired Patents = 20.0


Trademarks = 8

Forward Citations = 436

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32 inventors (with patents filed for the assignee):

goldMedal Anthony D Tantram (8 out of 9 patents)

silverMedal John Robert Finbow (5 out of 10 patents)

bronzeMedal Yat S Chan (5 out of 8 patents)

4.  Stuart Christopher Cutler (4 out of 4 patents)

5.  John Chapples (3 out of 23 patents)

6.  Peter John Smith (3 out of 3 patents)

7.  David Frank Davies (2 out of 3 patents)

8.  Ian Paul Andrews (2 out of 6 patents)

9.  Ramin Pirzad (2 out of 4 patents)

10.  Keith Francis Edwin Pratt (2 out of 2 patents)

11.  Bryan S Hobbs (2 out of 6 patents)

12.  Malcolm Robert Bulpitt (2 out of 2 patents)

13.  Peter J Sewell (2 out of 2 patents)

14.  David A Rohrbacker (1 out of 4 patents)

15.  Graham Collins (1 out of 1 patent)


Core Competencies:
Gas Sensor
Electrochemical Sensor
Humidity Resistance
Allergen Detection
Flammable Gas Detection
Gas Calibration
Solid State Sensor
Gas Detector
Diffusion Measurement
Gas Sensing Device
Assay Device
Gas Sensor Assembly

30 patents:

1. 8691066 - Gas sensor (2014-04-08),
2. 8318525 - Gas sensing device (2012-11-27),
3. 7575717 - Assay device for evaluating entrainable substances (2009-08-18),
4. 7541587 - Gas sensor (2009-06-02),
5. 7534333 - Electrochemical gas sensor (2009-05-19),
6. 7282168 - Gas sensor assembly and method (2007-10-16),
7. 7279080 - Gas sensors (2007-10-09),
8. 7236095 - Solid state sensor for carbon monoxide (2007-06-26),
9. 7195922 - Allergen detection (2007-03-27),
10. 7010957 - Gas sensors with improved resistance to humidity interference (2006-03-14),
11. 6993955 - Gas sensors (2006-02-07),
12. D500256 - Gas detector (2004-12-29),
13. D494879 - Gas detector (2004-08-25),
14. 6395230 - Pellistor (2002-05-28),
15. 5761952 - Electrochemical gas sensor (1998-06-09),
Company Overview
City Technology Limited, based in Portsmouth, specializes in the development and manufacturing of advanced gas sensing technologies. The company focuses on creating innovative solutions for a variety of applications, including environmental monitoring, industrial safety, and automotive systems. With a commitment to research and development, City Technology is recognized for its expertise in sensor technology, contributing to enhanced safety and efficiency across multiple sectors. Its geographic presence supports a global clientele, addressing diverse market needs.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 6 2026

City Technology Limited USPTO Patent Assignee Logo
30 Patents

#1 in Portsmouth

#593 in United Kingdom

#21,853 in the World

Portsmouth, GB
Portsmouth, United Kingdom

City Technology Limited

Forward Citations = 436

32 inventors:

goldMedal Anthony D Tantram (8 out of 9 patents)

silverMedal John Robert Finbow (5 out of 10 patents)

bronzeMedal Yat S Chan (5 out of 8 patents)

4.  Stuart Christopher Cutler (4 out of 4 patents)

5.  John Chapples (3 out of 23 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: City Technology Limited. Retrieved from https://idiyas.com/company/city-technology

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]
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