Growing community of inventors

Hiddenhausen, Germany

Matthias Friedrich

Average Co-Inventor Count = 2.00

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 = 17

Matthias FriedrichVolkmar Wolfl (2 patents)Matthias FriedrichMatthias Friedrich (2 patents)Volkmar WolflVolkmar Wolfl (4 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Van Riesen Gmbh U.co., Kg (2 from 3 patents)


2 patents:

1. 5833311 - Add-on child seat

2. 5743554 - Airbag arrangement

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as of
12/21/2025
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