Growing community of inventors

Monroe, NC, United States of America

Richard D Johnson

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 = 49

Richard D JohnsonRobert W Callahan (2 patents)Richard D JohnsonRichard D Johnson (2 patents)Robert W CallahanRobert W Callahan (7 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Hoechst Celanese Corporation (2 from 1,194 patents)


2 patents:

1. 5102552 - Membranes from UV-curable resins

2. 4976897 - Composite porous membranes and methods of making the same

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as of
12/13/2025
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