For the Inventor, By the Inventor

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Rockford, IL, United States of America

Bergstrom Manufacturing Co.

USPTO Granted Patents = 2

Forward Citations = 22

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5 inventors (with patents filed for the assignee):

William G Guo (1 out of 5 patents)

Dave Gavin (1 out of 1 patent)

Phillip Evans (1 out of 1 patent)

4. Tim Ruger (1 out of 1 patent)

5. Robert H Ahrens, Deceased (1 out of 1 patent)

2 patents: Sort by Forward Citations

1. 5619862 - Multi-channel motor vehicle ventilation apparatus (1997-04-15),

2. 4718453 - Rotary valve (1988-01-12),

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USPTO Data Jan 1 1976 - Dec 16 2025

2 Patents

#92 in Rockford, IL

#4,304 in Illinois

#92,554 in US

Rockford, IL, United States of America

Bergstrom Manufacturing Co.

Forward Citations = 22

5 inventors:

William G Guo (1 out of 5 patents)

Dave Gavin (1 out of 1 patent)

Phillip Evans (1 out of 1 patent)

4. Tim Ruger (1 out of 1 patent)

5. Robert H Ahrens, Deceased (1 out of 1 patent)

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