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Chadds Ford, PA, United States of America

David A Hannum

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 = 14

David A Hannum ↔ James D Nichols (1 patent)David A Hannum ↔ Richard Derby (1 patent)David A Hannum ↔ Glenn T Von Dem Bussche (1 patent)David A HannumDavid A Hannum (1 patent)James D NicholsJames D Nichols (17 patents)Richard DerbyRichard Derby (4 patents)Glenn T Von Dem BusscheGlenn T Von Dem Bussche (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Air Products and Chemicals, Inc. (1 from 3,189 patents)


1 patent:

1. 4557838 - Inhibiting acid corrosion of metals

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12/16/2025
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