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Northville, MI, United States of America

Karl E Gierman

Average Co-Inventor Count = 2.00

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 = 45

Karl E GiermanPaul Mandrik (1 patent)Karl E GiermanRobert I Homier (1 patent)Karl E GiermanKarl E Gierman (2 patents)Paul MandrikPaul Mandrik (17 patents)Robert I HomierRobert I Homier (8 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Other (1 from 832,718 patents)

2. Douglas & Lomason Company (1 from 20 patents)


2 patents:

1. 5449216 - Integral child seat and seat frame combination

2. 5385384 - Child safety seat

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as of
12/16/2025
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