Growing community of inventors

Carl Junction, MO, United States of America

Charles Doyle Ziulkowski

Average Co-Inventor Count = 3.00

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 = 23

Charles Doyle ZiulkowskiRandal J Jolitz (6 patents)Charles Doyle ZiulkowskiDennis Dean Carlson (6 patents)Charles Doyle ZiulkowskiCharles Doyle Ziulkowski (6 patents)Randal J JolitzRandal J Jolitz (12 patents)Dennis Dean CarlsonDennis Dean Carlson (8 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Epoch Composite Products, Inc. (4 from 10 patents)

2. Tamko Building Products, Inc. (2 from 32 patents)


6 patents:

1. 8099923 - Roofing shingle with a laying line

2. 7882677 - Roofing shingle with a laying line

3. 7700028 - Method for manufacturing roofing products

4. 7516593 - Roofing shingle with a laying line

5. 7475516 - Roofing shingle with a laying line

6. 6935089 - Methods of manufacturing roofing products

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as of
12/12/2025
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