Growing community of inventors

Tokyo, Japan

Etsuo Kawaji

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 = 35

Etsuo Kawaji ↔ Koichi Yajima (1 patent)Etsuo Kawaji ↔ Zhongkai Yang (1 patent)Etsuo KawajiEtsuo Kawaji (2 patents)Koichi YajimaKoichi Yajima (22 patents)Zhongkai YangZhongkai Yang (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Foster Electric Company, Limited (2 from 64 patents)


2 patents:

1. D761233 - Earphone

2. D726165 - Earphone

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as of
12/11/2025
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