For the Inventor, By the Inventor

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Holland, MI, United States of America

Dfk Inc.

USPTO Granted Patents = 3

Forward Citations = 41

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1 inventor (with patents filed for the assignee):

James A Kammeraad (3 out of 26 patents)

3 patents: Sort by Forward Citations

1. 4156320 - Downrigger (1979-05-29),

2. D243177 - Trolling weight (1977-01-25),

3. 3968587 - Downrigger (1976-07-13),

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USPTO Data Jan 1 1976 - Dec 23 2025

3 Patents

#48 in Holland, MI

#2,442 in Michigan

#71,950 in US

Holland, MI, United States of America

Dfk Inc.

Forward Citations = 41

1 inventor:

James A Kammeraad (3 out of 26 patents)

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