For the Inventor, By the Inventor

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Pi Research Limited

USPTO Granted Patents = 1

Forward Citations = 68

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5 inventors (with patents filed for the assignee):

Anthony J Purnell (1 out of 1 patent)

Keith A Bradbury (1 out of 1 patent)

John C Mumford (1 out of 1 patent)

4. Mark J Broadbent (1 out of 2 patents)

5. Raymond A Wardell (1 out of 1 patent)

1 patent: Sort by Forward Citations

1. 5173856 - Vehicle data recording system (1992-12-22),

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USPTO Data Jan 1 1976 - Jan 13 2026

1 Patents

#1,134 in

#9,678 in United Kingdom

Pi Research Limited

Forward Citations = 68

5 inventors:

Anthony J Purnell (1 out of 1 patent)

Keith A Bradbury (1 out of 1 patent)

John C Mumford (1 out of 1 patent)

4. Mark J Broadbent (1 out of 2 patents)

5. Raymond A Wardell (1 out of 1 patent)

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