Growing community of inventors

Kingwood, TX, United States of America

David Holdman

Average Co-Inventor Count = 3.00

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 HoldmanMark Ellsworth Wassell (1 patent)David HoldmanBill Murray (1 patent)David HoldmanDavid Holdman (1 patent)Mark Ellsworth WassellMark Ellsworth Wassell (28 patents)Bill MurrayBill Murray (1 patent)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Aps Technology, Inc. (1 from 63 patents)


1 patent:

1. 10233700 - Downhole drilling motor with an adjustment assembly

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as of
12/12/2025
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