Growing community of inventors

Spring Grove, IL, United States of America

David H Graef

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 = 0

David H GraefJames D McPhail (1 patent)David H GraefPeter Allan Manos (1 patent)David H GraefDaniel Stumpo (1 patent)David H GraefDavid H Graef (1 patent)James D McPhailJames D McPhail (7 patents)Peter Allan ManosPeter Allan Manos (6 patents)Daniel StumpoDaniel Stumpo (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Spm Oil & Gas Inc. (1 from 93 patents)


1 patent:

1. 11732814 - Plug valve assembly

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12/17/2025
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