Growing community of inventors

Kanagawa, Japan

Takahiro Hirai

Average Co-Inventor Count = 2.20

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 = 110

Takahiro HiraiHiroshi Koyama (1 patent)Takahiro HiraiHiroshi Masuda (1 patent)Takahiro HiraiAkira Katsuyama (1 patent)Takahiro HiraiHiroshi Mizuno (1 patent)Takahiro HiraiTomohiro Koyata (1 patent)Takahiro HiraiShuichi Nagano (1 patent)Takahiro HiraiTakashi Koya (1 patent)Takahiro HiraiTakashi Ishizuka (1 patent)Takahiro HiraiKeiichi Asakura (1 patent)Takahiro HiraiMasami Ishikawa (1 patent)Takahiro HiraiShinji Isozaki (1 patent)Takahiro HiraiTakahiro Hirai (3 patents)Hiroshi KoyamaHiroshi Koyama (72 patents)Hiroshi MasudaHiroshi Masuda (50 patents)Akira KatsuyamaAkira Katsuyama (36 patents)Hiroshi MizunoHiroshi Mizuno (35 patents)Tomohiro KoyataTomohiro Koyata (19 patents)Shuichi NaganoShuichi Nagano (14 patents)Takashi KoyaTakashi Koya (9 patents)Takashi IshizukaTakashi Ishizuka (7 patents)Keiichi AsakuraKeiichi Asakura (5 patents)Masami IshikawaMasami Ishikawa (4 patents)Shinji IsozakiShinji Isozaki (3 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Sony Corporation (3 from 58,130 patents)


3 patents:

1. 6622158 - Character information copying system, recording apparatus, and recording method

2. 6313812 - Single remote control system for plurality of audio and visual equipment

3. 5892519 - Information display device for displaying variation of environment

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as of
12/19/2025
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