Growing community of inventors

Albany, IL, United States of America

Duane D Franzen, Jr

Average Co-Inventor Count = 3.00

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 = 5

Duane D Franzen, JrMichael Grinnall (1 patent)Duane D Franzen, JrRichard J Gruetzmacher (1 patent)Duane D Franzen, JrDuane D Franzen, Jr (1 patent)Michael GrinnallMichael Grinnall (15 patents)Richard J GruetzmacherRichard J Gruetzmacher (12 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Johnson Level & Tool Mfg. Co., Inc. (1 from 85 patents)


1 patent:

1. 7172067 - Level case with positioning indentations

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as of
12/18/2025
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