Growing community of inventors

Lebanon, NH, United States of America

David D Johnson

Average Co-Inventor Count = 3.00

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 = 37

David D JohnsonRichard Mark Greenwald (2 patents)David D JohnsonJeffrey J Chu (2 patents)David D JohnsonDavid D Johnson (2 patents)Richard Mark GreenwaldRichard Mark Greenwald (21 patents)Jeffrey J ChuJeffrey J Chu (14 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Simbex LLC (2 from 6 patents)


2 patents:

1. 8622747 - Training system and method using a dynamic perturbation platform

2. 8246354 - Training system and method using a dynamic perturbation platform

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as of
12/18/2025
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