Growing community of inventors

Greensburg, PA, United States of America

David C Johnston

Average Co-Inventor Count = 2.57

ph-index = 3

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 = 50

David C Johnston ↔ Franz Havrda (2 patents)David C Johnston ↔ Rudi Hartlohner (2 patents)David C Johnston ↔ Kenneth L Niebauer (1 patent)David C JohnstonDavid C Johnston (3 patents)Franz HavrdaFranz Havrda (16 patents)Rudi HartlohnerRudi Hartlohner (11 patents)Kenneth L NiebauerKenneth L Niebauer (39 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Kennametal Inc. (3 from 1,547 patents)


3 patents:

1. D523040 - Cutting tool insert

2. D431579 - Cutting insert

3. D423024 - Cutting insert

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as of
1/20/2026
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