Growing community of inventors

Grayslake, IL, United States of America

Robert A Simpson

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 = 70

Robert A Simpson ↔ David Ziegenhorn (2 patents)Robert A SimpsonRobert A Simpson (2 patents)David ZiegenhornDavid Ziegenhorn (7 patents)
..
Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Crown Packaging Technology, Inc. (2 from 342 patents)


2 patents:

1. D508853 - Child-resistant closure

2. D508203 - Child-resistant closure

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as of
1/10/2026
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