Growing community of inventors

Amsterdam, Netherlands

Hugo Martijn Letzel

Average Co-Inventor Count = 1.33

ph-index = 2

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 = 11

Hugo Martijn LetzelGerrit Konijn (1 patent)Hugo Martijn LetzelHugo Martijn Letzel (2 patents)Gerrit KonijnGerrit Konijn (13 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Shell Oil Comapny (2 from 7,646 patents)


2 patents:

1. 7004988 - Gas-liquid separator

2. 6905112 - Column for counter-currently contacting vapor and liquid

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as of
12/18/2025
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