For the Inventor, By the Inventor

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Cleveland, OH, United States of America

National Utility Products Company

USPTO Granted Patents = 3

Forward Citations = 23

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4 inventors (with patents filed for the assignee):

Harold M Bowman (2 out of 30 patents)

Carl W Knight (1 out of 1 patent)

William H Greenwald (1 out of 1 patent)

4. Richard G Hart (1 out of 1 patent)

3 patents: Sort by Forward Citations

1. 4236358 - Adjustable manhole cover support structure (1980-12-02),

2. D256612 - Fireplace grate (1980-08-26),

3. 3968600 - Adjustable manhole cover support structure (1976-07-13),

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USPTO Data Jan 1 1976 - Dec 16 2025

3 Patents

#339 in Cleveland, OH

#2,785 in Ohio

#71,949 in US

Cleveland, OH, United States of America

National Utility Products Company

Forward Citations = 23

4 inventors:

Harold M Bowman (2 out of 30 patents)

Carl W Knight (1 out of 1 patent)

William H Greenwald (1 out of 1 patent)

4. Richard G Hart (1 out of 1 patent)

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