Growing community of inventors

Ibaraki, Japan

Katsumi Kumagai

Average Co-Inventor Count = 5.60

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 = 42

Katsumi KumagaiSeiji Kageyama (3 patents)Katsumi KumagaiTatsuro Akabane (3 patents)Katsumi KumagaiKazuyoshi Tokunaga (2 patents)Katsumi KumagaiKazuyuki Mitome (2 patents)Katsumi KumagaiTomoko Kitaura (2 patents)Katsumi KumagaiMasamitsu Suzuki (2 patents)Katsumi KumagaiTakeshi Yamaguchi (1 patent)Katsumi KumagaiKatsumi Kumagai (3 patents)Seiji KageyamaSeiji Kageyama (9 patents)Tatsuro AkabaneTatsuro Akabane (3 patents)Kazuyoshi TokunagaKazuyoshi Tokunaga (13 patents)Kazuyuki MitomeKazuyuki Mitome (4 patents)Tomoko KitauraTomoko Kitaura (2 patents)Masamitsu SuzukiMasamitsu Suzuki (2 patents)Takeshi YamaguchiTakeshi Yamaguchi (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Ricoh Printing Systems, Ltd. (2 from 129 patents)

2. Hitachi Koki Co., Ltd. (1 from 1,267 patents)


3 patents:

1. 7209256 - Document processing method

2. 7092117 - Print system

3. 6567180 - Document printing method

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as of
12/12/2025
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