Growing community of inventors

Sagamihara, Japan

Fumio Usui

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 = 42

Fumio Usui ↔ Masaaki Tanaka (1 patent)Fumio Usui ↔ Tatsuro Shirai (1 patent)Fumio Usui ↔ Yuuji Yanagishita (1 patent)Fumio UsuiFumio Usui (1 patent)Masaaki TanakaMasaaki Tanaka (6 patents)Tatsuro ShiraiTatsuro Shirai (2 patents)Yuuji YanagishitaYuuji Yanagishita (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Victor Company of Japan, Limited (1 from 2,887 patents)


1 patent:

1. 7372974 - Headphone with cord winder devices

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as of
12/12/2025
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