Growing community of inventors

Oxford, United Kingdom

Dennis J Simpkin

Average Co-Inventor Count = 3.00

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 = 2

Dennis J Simpkin ↔ John A Cleverley (1 patent)Dennis J Simpkin ↔ John F Marsh (1 patent)Dennis J SimpkinDennis J Simpkin (1 patent)John A CleverleyJohn A Cleverley (10 patents)John F MarshJohn F Marsh (9 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Exxon Research and Engineering Company (1 from 4,227 patents)


1 patent:

1. 4557872 - Basic alkaline earth metal sulphonates

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12/10/2025
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