Growing community of inventors

London, Canada

David R Chapman

Average Co-Inventor Count = 2.00

ph-index = 2

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 = 17

David R ChapmanCharles G Shepherd (2 patents)David R ChapmanDavid R Chapman (2 patents)Charles G ShepherdCharles G Shepherd (41 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. The Chas. Chapman Company Limited (2 from 3 patents)


2 patents:

1. D310099 - Book holder

2. 4561623 - Book holder

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as of
12/20/2025
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