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Ilford, United Kingdom

The Plessey Company Plc

USPTO Granted Patents = 36

Forward Citations = 830

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49 inventors (with patents filed for the assignee):

Alexander S Philip (9 out of 14 patents)

Geoffrey Chopping (8 out of 30 patents)

Thomas S Maddern (8 out of 24 patents)

4. Clive Trundle (6 out of 11 patents)

5. Stephen N Oliver (5 out of 6 patents)

6. Harry G Heller (3 out of 8 patents)

7. Jack Brettle (3 out of 9 patents)

8. John W Ansell (3 out of 3 patents)

9. Ian Bennion (2 out of 14 patents)

10. Ernest Culley (2 out of 2 patents)

11. Frederick H Rees (2 out of 4 patents)

12. Anthony E Shuttleworth (2 out of 3 patents)

13. Milan Z Maric (2 out of 2 patents)

14. Martin W Baskerville (2 out of 2 patents)

15. John Whittall (2 out of 2 patents)

Core Competencies:

Amplifier Arrangement

Photochromic Compounds

Digital Switching

Telecommunications Exchange

Optical Devices

Signal Multiplexing

LED Array

Telecommunications Network

Frame Aligner

Heat Exchange

Fluid-Flow Devices

Antenna Array

36 patents: Sort by Forward Citations

1. 5130668 - Amplifier arrangement with time constant control (1992-07-14),

2. 4990287 - Optical devices utilizing photochromic compounds (1991-02-05),

3. 4984236 - Circuit arrangement for use in the time division multiplexed signalling (1991-01-08),

4. 4912700 - Telecommunications digital switch (1990-03-27),

5. 4905223 - Wideband/multislot switching arrangement (1990-02-27),

6. 4888603 - Light emitting diode array (1989-12-19),

7. 4864556 - Synchronization arrangements for a digital telecommunications exchange (1989-09-05),

8. 4861899 - Photochromic gamma butyrolactones (1989-08-29),

9. 4858223 - Security arrangement for a telecommunications exchange system (1989-08-15),

10. 4838634 - Organic optical waveguides and method of fabricating waveguide structures (1989-06-13),

11. 4826977 - Photochromic spiropyran compounds (1989-05-02),

12. 4818096 - Photoreactive lenses with adamantane spiro compounds (1989-04-04),

13. 4812171 - Irreversible photochromic markings (1989-03-14),

14. 4794644 - Method of secured communications in a telecommunications system (1988-12-27),

15. 4737449 - Photochromic 3-pyrryl fulgides and fulgimides (1988-04-12),

Company Overview

The Plessey Company Plc, headquartered in Ilford, UK, specializes in advanced semiconductor technologies and innovative electronic solutions. The company focuses on the development and manufacturing of high-performance components for various applications, including lighting, sensing, and communications. Plessey is recognized for its expertise in optoelectronics and integrated circuits, contributing to sectors such as automotive, aerospace, and consumer electronics, while emphasizing sustainability and energy efficiency in its product offerings.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 6 2026

36 Patents

#2 in Ilford

#503 in United Kingdom

#18,716 in the World

Ilford, United Kingdom

The Plessey Company Plc

Forward Citations = 830

49 inventors:

Alexander S Philip (9 out of 14 patents)

Geoffrey Chopping (8 out of 30 patents)

Thomas S Maddern (8 out of 24 patents)

4. Clive Trundle (6 out of 11 patents)

5. Stephen N Oliver (5 out of 6 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: The Plessey Company Plc. Retrieved from https://idiyas.com/company/plessey-company

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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