For the Inventor, By the Inventor

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Saint Paul, MN, United States of America

Lull Engineering Company, Inc.

USPTO Granted Patents = 3

Forward Citations = 31

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4 inventors (with patents filed for the assignee):

James A Prokop (2 out of 2 patents)

Ernst A Dahlquist (1 out of 1 patent)

Sherman B Frederick (1 out of 5 patents)

4. David C Truehart (1 out of 1 patent)

3 patents: Sort by Forward Citations

1. 4683802 - Divided flow self-leveling system (1987-08-04),

2. 4336720 - Load sensing system (1982-06-29),

3. 4147263 - High lift loader with extended transfer (1979-04-03),

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USPTO Data Jan 1 1976 - Dec 23 2025

3 Patents

#211 in Saint Paul, MN

#1,945 in Minnesota

#71,950 in US

Saint Paul, MN, United States of America

Lull Engineering Company, Inc.

Forward Citations = 31

4 inventors:

James A Prokop (2 out of 2 patents)

Ernst A Dahlquist (1 out of 1 patent)

Sherman B Frederick (1 out of 5 patents)

4. David C Truehart (1 out of 1 patent)

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