Growing community of inventors

Shrewsbury, MA, United States of America

Ronald R Duff

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 = 17

Ronald R DuffThomas Aurele Christman (8 patents)Ronald R DuffHelge Zimmet (8 patents)Ronald R DuffJoseph A Depuydt (8 patents)Ronald R DuffEdward J Mangan (8 patents)Ronald R DuffKaren Claire-Zimmet (8 patents)Ronald R DuffWilliam R Brown (8 patents)Ronald R DuffJoanna Q Deng (7 patents)Ronald R DuffRainer Hans (5 patents)Ronald R DuffRudolf Majthan (4 patents)Ronald R DuffPhilip M Braun (3 patents)Ronald R DuffRudolf Majthan (3 patents)Ronald R DuffRainer Hans (3 patents)Ronald R DuffThomas Craig Masterman (2 patents)Ronald R DuffRichard H Cohen (2 patents)Ronald R DuffJoseph Synodis (2 patents)Ronald R DuffAlexander Timothy Chenvainu (1 patent)Ronald R DuffPhillip Maurice Braun (1 patent)Ronald R DuffKaren Claire (1 patent)Ronald R DuffAmit Birla (1 patent)Ronald R DuffJoanna Q Deng (1 patent)Ronald R DuffJoseph Synodis (0 patent)Ronald R DuffWilliam R Brown (0 patent)Ronald R DuffJoanna Q Deng (0 patent)Ronald R DuffWilliam Ralph Brown (1 patent)Ronald R DuffRonald R Duff (1 patent)Thomas Aurele ChristmanThomas Aurele Christman (14 patents)Helge ZimmetHelge Zimmet (8 patents)Joseph A DepuydtJoseph A Depuydt (9 patents)Edward J ManganEdward J Mangan (8 patents)Karen Claire-ZimmetKaren Claire-Zimmet (8 patents)William R BrownWilliam R Brown (11 patents)Joanna Q DengJoanna Q Deng (7 patents)Rainer HansRainer Hans (5 patents)Rudolf MajthanRudolf Majthan (4 patents)Philip M BraunPhilip M Braun (3 patents)Rudolf MajthanRudolf Majthan (3 patents)Rainer HansRainer Hans (3 patents)Thomas Craig MastermanThomas Craig Masterman (11 patents)Richard H CohenRichard H Cohen (2 patents)Joseph SynodisJoseph Synodis (5 patents)Alexander Timothy ChenvainuAlexander Timothy Chenvainu (9 patents)Phillip Maurice BraunPhillip Maurice Braun (23 patents)Karen ClaireKaren Claire (3 patents)Amit BirlaAmit Birla (3 patents)Joanna Q DengJoanna Q Deng (1 patent)Joseph SynodisJoseph Synodis (0 patent)William R BrownWilliam R Brown (0 patent)Joanna Q DengJoanna Q Deng (0 patent)William Ralph BrownWilliam Ralph Brown (5 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Gillette Canada Company (1 from 26 patents)

2. The Gillette Company (2,667 patents)


1 patent:

1. 6823554 - Oral devices

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1/21/2026
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