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North Liberty, IA, United States of America

John Michael Steffen

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 = 7

John Michael SteffenJohn Michael Steffen (1 patent)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Civco Medical Instruments Co., Inc. (1 from 31 patents)


1 patent:

1. 9149251 - Hinged reusable endocavity needle guide

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as of
1/13/2026
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