Growing community of inventors

Cedarburg, WI, United States of America

Charles Hardy Ketelhohn

Average Co-Inventor Count = 1.20

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 = 115

Charles Hardy KetelhohnRichard A Dykstra (1 patent)Charles Hardy KetelhohnCharles Hardy Ketelhohn (3 patents)Richard A DykstraRichard A Dykstra (29 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Milwaukee Electronics Corporation (2 from 10 patents)

2. Briggs & Stratton, LLC (1 from 778 patents)


3 patents:

1. 6765489 - Accelerometer-based infant movement monitoring and alarm device

2. 6711427 - Skin abrading medical electrode mounting and packaging system

3. 6595897 - Combination speed limiter and transmission interlock system

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as of
12/8/2025
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