Growing community of inventors

Washington, IL, United States of America

James H Tunnell

Average Co-Inventor Count = 3.00

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 = 30

James H Tunnell ↔ Elmer R Crabb (1 patent)James H Tunnell ↔ James Robert Bernhagen (1 patent)James H Tunnell ↔ Gene R St Germain (1 patent)James H Tunnell ↔ Hugh V Piper (1 patent)James H Tunnell ↔ Daniel G Roley (1 patent)James H Tunnell ↔ Marilyn S Murphy (1 patent)James H TunnellJames H Tunnell (2 patents)Elmer R CrabbElmer R Crabb (18 patents)James Robert BernhagenJames Robert Bernhagen (4 patents)Gene R St GermainGene R St Germain (4 patents)Hugh V PiperHugh V Piper (2 patents)Daniel G RoleyDaniel G Roley (1 patent)Marilyn S MurphyMarilyn S Murphy (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Caterpillar Inc. (1 from 9,451 patents)

2. Caterpillar Tractor Co. (1 from 1,981 patents)


2 patents:

1. 4700794 - Vehicle steering apparatus

2. 4376474 - Automatic brake speed bleed system

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as of
12/13/2025
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