Growing community of inventors

Hopkins, MN, United States of America

Robert A Holdahl

Average Co-Inventor Count = 1.50

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 = 11

Robert A HoldahlPaul S Petersen (2 patents)Robert A HoldahlRobert A Holdahl (3 patents)Paul S PetersenPaul S Petersen (23 patents)
..
Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Toolmark Co. (3 from 4 patents)


3 patents:

1. 4491162 - Hand held duplicator tool

2. 4398579 - Lathe work centers

3. 4284111 - Wood lathe tool

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as of
12/20/2025
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