Growing community of inventors

Lafayette Hills, PA, United States of America

Thomas J Drennen

Average Co-Inventor Count = 2.00

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 = 19

Thomas J DrennenRobert A Gill (1 patent)Thomas J DrennenThomas J Drennen (1 patent)Robert A GillRobert A Gill (5 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Rohm and Haas Company (1 from 3,391 patents)


1 patent:

1. 4190491 - Process for controlling pitch in papermaking

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as of
12/19/2025
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