Growing community of inventors

Tokyo, Japan

Keiichi Maruyama

Average Co-Inventor Count = 2.11

ph-index = 4

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 = 54

Keiichi MaruyamaToshio Kobayashi (2 patents)Keiichi MaruyamaYukio Ohnuki (2 patents)Keiichi MaruyamaSatoshi Inoue (1 patent)Keiichi MaruyamaKeiji Sato (1 patent)Keiichi MaruyamaHiroaki Etoh (1 patent)Keiichi MaruyamaTakashi Hirose (1 patent)Keiichi MaruyamaShogo Oki (1 patent)Keiichi MaruyamaKeiichi Maruyama (5 patents)Toshio KobayashiToshio Kobayashi (116 patents)Yukio OhnukiYukio Ohnuki (2 patents)Satoshi InoueSatoshi Inoue (99 patents)Keiji SatoKeiji Sato (80 patents)Hiroaki EtohHiroaki Etoh (13 patents)Takashi HiroseTakashi Hirose (11 patents)Shogo OkiShogo Oki (5 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Fuji Jukogyo Kabushiki Kaisha (3 from 2,208 patents)

2. International Business Machines Corporation (2 from 164,244 patents)


5 patents:

1. 9676267 - Drive apparatus for a vehicle

2. 7949715 - Method, server and program product for delivering messages

3. 5553212 - Method and apparatus for solving numerical planning problems with

4. 5234091 - Power transmission system for a four-wheel drive motor vehicle

5. 5148903 - Power transmission system for a four-wheel drive motor vehicle

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as of
1/11/2026
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