Growing community of inventors

Donaueschingen, Germany

Friedhelm Keller

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 = 8

Friedhelm Keller ↔ Dirk Alexander Petry (1 patent)Friedhelm Keller ↔ Helmut Hilger (1 patent)Friedhelm KellerFriedhelm Keller (1 patent)Dirk Alexander PetryDirk Alexander Petry (11 patents)Helmut HilgerHelmut Hilger (3 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Georg Fischer Rohrleitungssysteme Ag (1 from 75 patents)


1 patent:

1. 5255943 - Welding sleeve and method for its manufacture

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12/16/2025
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