Growing community of inventors

Hitachi, Japan

Naoki Kumagai

Average Co-Inventor Count = 6.00

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 = 0

Naoki KumagaiMasashi Oda (2 patents)Naoki KumagaiMasashi Shimizu (2 patents)Naoki KumagaiHidetoshi Kanai (2 patents)Naoki KumagaiKeiichiro Shibata (2 patents)Naoki KumagaiKoichi Maki (2 patents)Naoki KumagaiNaoki Kumagai (2 patents)Masashi OdaMasashi Oda (5 patents)Masashi ShimizuMasashi Shimizu (3 patents)Hidetoshi KanaiHidetoshi Kanai (3 patents)Keiichiro ShibataKeiichiro Shibata (3 patents)Koichi MakiKoichi Maki (2 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Hitachi, Ltd. (2 from 42,517 patents)


2 patents:

1. 6501814 - Dry radioactive substance storage facility

2. 6430248 - Dry radioactive substance storage facility

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as of
1/7/2026
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