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Farnborough, United Kingdom

John Marshall

Average Co-Inventor Count = 2.00

ph-index = 3

The patent ph-index is calculated by counting the number of publications for which an author has been cited by other authors at least that same number of times.

Forward Citations = 36

John MarshallDavid Usher (3 patents)John MarshallJohn Marshall (3 patents)David UsherDavid Usher (3 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Retinal Technologies, Inc. (3 from 4 patents)


3 patents:

1. 6993161 - Method for generating a unique and consistent signal pattern for identification of an individual

2. 6757409 - Method for generating a unique and consistent signal pattern for identification of an individual

3. 6453057 - Method for generating a unique consistent signal pattern for identification of an individual

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12/26/2025
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