Growing community of inventors

Tokyo, Japan

Eiji Takuma

Average Co-Inventor Count = 2.57

ph-index = 3

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 = 25

Eiji TakumaTakashi Matsuda (1 patent)Eiji TakumaSatoshi Yamada (1 patent)Eiji TakumaAkira Takasaka (1 patent)Eiji TakumaHirotsugu Tomizawa (1 patent)Eiji TakumaNobuo Yokoyama (1 patent)Eiji TakumaEiji Takuma (3 patents)Takashi MatsudaTakashi Matsuda (186 patents)Satoshi YamadaSatoshi Yamada (36 patents)Akira TakasakaAkira Takasaka (10 patents)Hirotsugu TomizawaHirotsugu Tomizawa (5 patents)Nobuo YokoyamaNobuo Yokoyama (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Sega Enterprises, Ltd. (3 from 264 patents)


3 patents:

1. 6484942 - Information storage medium, information reproducing apparatus, game machine and its information reproducing method

2. 5805120 - Head-up display apparatus

3. 5092808 - Air action toy system

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as of
12/16/2025
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