Growing community of inventors

Watford/Herts, United Kingdom

Llewelyn J Leyshon

Average Co-Inventor Count = 2.00

ph-index = 1

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 = 0

Llewelyn J LeyshonDavid T Clarke (1 patent)Llewelyn J LeyshonLlewelyn J Leyshon (1 patent)David T ClarkeDavid T Clarke (19 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Eastman-kodak Company (1 from 21,594 patents)


1 patent:

1. 5374511 - Photographic color couplers and photographic materials containing them

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12/6/2025
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