Growing community of inventors

Nagareyama, Japan

Atsuo Koyama

Average Co-Inventor Count = 5.09

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 = 29

Atsuo Koyama ↔ Tetsuo Ono (1 patent)Atsuo Koyama ↔ Seiichi Murayama (1 patent)Atsuo Koyama ↔ Hiromitsu Matsuno (1 patent)Atsuo Koyama ↔ Yasusuke Seki (1 patent)Atsuo Koyama ↔ Churyo Kodama (1 patent)Atsuo Koyama ↔ Hisato Nakagawa (1 patent)Atsuo Koyama ↔ Mitsuo Akatsuka (1 patent)Atsuo Koyama ↔ Tsuyoshi Kobayashi (1 patent)Atsuo Koyama ↔ Hideo Kuwahara (1 patent)Atsuo KoyamaAtsuo Koyama (2 patents)Tetsuo OnoTetsuo Ono (55 patents)Seiichi MurayamaSeiichi Murayama (33 patents)Hiromitsu MatsunoHiromitsu Matsuno (9 patents)Yasusuke SekiYasusuke Seki (8 patents)Churyo KodamaChuryo Kodama (6 patents)Hisato NakagawaHisato Nakagawa (1 patent)Mitsuo AkatsukaMitsuo Akatsuka (1 patent)Tsuyoshi KobayashiTsuyoshi Kobayashi (1 patent)Hideo KuwaharaHideo Kuwahara (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Hitachi, Ltd. (1 from 42,485 patents)

2. Hitachi Lighting, Ltd. (1 from 4 patents)


2 patents:

1. 5034655 - Circular fluorescent lamp

2. 4694224 - Lighting apparatus for an electric discharge lamp

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as of
12/8/2025
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