Growing community of inventors

Glen Ellyn, IL, United States of America

Donald R Hill

Average Co-Inventor Count = 1.29

ph-index = 3

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 = 53

Donald R HillJames Gafkowski (3 patents)Donald R HillJames A Gafkowski (1 patent)Donald R HillDonald R Hill (9 patents)James GafkowskiJames Gafkowski (3 patents)James A GafkowskiJames A Gafkowski (1 patent)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Other (3 from 832,718 patents)

2. Formtek, Inc. (3 from 15 patents)

3. Hill Engineering, Inc. (3 from 10 patents)


9 patents:

1. 11583910 - Rotary stamper

2. 10137489 - Rotary stamper

3. 8783082 - Rotary stamper

4. 8147391 - Exercise bar

5. 6450752 - Method and apparatus for incrementally feeding a tube along a linear tube path

6. 6354180 - System for cutting sheet material

7. 5690011 - Hydraulic double-cut tube cutoff

8. 4129273 - Kite control mechanism

9. 4015496 - Dimpleless tube cutoff device

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idiyas.com
as of
12/16/2025
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