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Barrington, IL, United States of America

Richard Maddrell

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 = 85

Richard MaddrellThomas L Maser (2 patents)Richard MaddrellRichard Maddrell (2 patents)Thomas L MaserThomas L Maser (7 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Publications International, Ltd. (2 from 6 patents)


2 patents:

1. 6041215 - Method for making an electronic book for producing audible sounds in

2. 5803748 - Apparatus for producing audible sounds in response to visual indicia

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as of
12/19/2025
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