Growing community of inventors

Highland, MI, United States of America

Douglas B Vonderhaar

Average Co-Inventor Count = 2.00

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 = 9

Douglas B VonderhaarDonald E McGeachy (1 patent)Douglas B VonderhaarDouglas B Vonderhaar (1 patent)Donald E McGeachyDonald E McGeachy (11 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Numatics Gmbh (1 from 33 patents)


1 patent:

1. 4742841 - Water shut-off valve

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as of
12/19/2025
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