Growing community of inventors

Hillsdale, MI, United States of America

Stephen D Johnson

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 = 17

Stephen D JohnsonStephen D Johnson (1 patent)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Eagle-picher Industries, Inc. (1 from 117 patents)


1 patent:

1. 6386836 - Dual gerotor pump for use with automatic transmission

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as of
12/13/2025
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