Growing community of inventors

New York, NY, United States of America

Frederick Hadtke

Average Co-Inventor Count = 1.00

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 = 19

Frederick HadtkeFrederick Hadtke (1 patent)
..
Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Koh-i-noor Inc. (1 from 8 patents)


1 patent:

1. D369830 - Tubular pen

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as of
12/19/2025
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