Growing community of inventors

Des Moines, IA, United States of America

Norman R Engman

Average Co-Inventor Count = 1.00

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 = 31

Norman R EngmanNorman R Engman (3 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Emco Specialties, Inc. (2 from 6 patents)

2. Emco Industries, Inc. (1 from 5 patents)


3 patents:

1. 4195433 - Utility signal device

2. 4155189 - Utility signal device

3. 4103965 - Fishing chair

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as of
1/10/2026
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