Growing community of inventors

Suwa, Japan

Keiichi Kumagai

Average Co-Inventor Count = 2.86

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 = 2

Keiichi KumagaiKatsuhiro Okubo (1 patent)Keiichi KumagaiNoriaki Okazawa (1 patent)Keiichi KumagaiYasunori Koike (1 patent)Keiichi KumagaiTakeshi Fujishiro (1 patent)Keiichi KumagaiShogo Nakada (1 patent)Keiichi KumagaiKeiichi Kumagai (2 patents)Katsuhiro OkuboKatsuhiro Okubo (70 patents)Noriaki OkazawaNoriaki Okazawa (58 patents)Yasunori KoikeYasunori Koike (27 patents)Takeshi FujishiroTakeshi Fujishiro (22 patents)Shogo NakadaShogo Nakada (13 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Seiko Epson Corporation (2 from 33,490 patents)


2 patents:

1. 11932020 - Liquid container

2. 7871157 - Liquid-jet apparatus liquid introducing needle with air intake suppression

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as of
1/9/2026
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