Growing community of inventors

Munich, Georgia

Hartmut Grethen

Average Co-Inventor Count = 4.44

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 = 6

Hartmut Grethen ↔ Wolfgang Pekruhn (2 patents)Hartmut Grethen ↔ Oskar Nuyken (1 patent)Hartmut Grethen ↔ Ferdinand Quella (1 patent)Hartmut Grethen ↔ Raimund Nisius (1 patent)Hartmut Grethen ↔ Barbara Dorner (1 patent)Hartmut Grethen ↔ Friedrich Drees (1 patent)Hartmut GrethenHartmut Grethen (2 patents)Wolfgang PekruhnWolfgang Pekruhn (6 patents)Oskar NuykenOskar Nuyken (44 patents)Ferdinand QuellaFerdinand Quella (20 patents)Raimund NisiusRaimund Nisius (6 patents)Barbara DornerBarbara Dorner (1 patent)Friedrich DreesFriedrich Drees (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Mannesmann Aktiengesellschaft (2 from 1,150 patents)


2 patents:

1. 5365348 - Process for printing a halftone image

2. 5158929 - Inking ribbon

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as of
12/15/2025
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