Growing community of inventors

Ashland, KY, United States of America

Duane K Chapman

Average Co-Inventor Count = 4.00

ph-index = 1

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 = 5

Duane K Chapman ↔ James E Lewis (1 patent)Duane K Chapman ↔ Marvin L Deviney, Jr (1 patent)Duane K Chapman ↔ Lawrence E Whittington (1 patent)Duane K ChapmanDuane K Chapman (1 patent)James E LewisJames E Lewis (4 patents)Marvin L Deviney, JrMarvin L Deviney, Jr (3 patents)Lawrence E WhittingtonLawrence E Whittington (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Ashland Oil, Inc. (1 from 632 patents)


1 patent:

1. 4193900 - Fire carcass resilient rubber compositions

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as of
12/17/2025
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