Growing community of inventors

Sapporo, Japan

Takeo Hirokawa

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

Takeo HirokawaChizu Sekine (1 patent)Takeo HirokawaYusuke Ishii (1 patent)Takeo HirokawaNoboru Kitamura (1 patent)Takeo HirokawaEri Sakuda (1 patent)Takeo HirokawaAkitaka Ito (1 patent)Takeo HirokawaTakeo Hirokawa (1 patent)Chizu SekineChizu Sekine (33 patents)Yusuke IshiiYusuke Ishii (6 patents)Noboru KitamuraNoboru Kitamura (6 patents)Eri SakudaEri Sakuda (2 patents)Akitaka ItoAkitaka Ito (2 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Sumitomo Chemical Company, Limited (1 from 6,894 patents)

2. Hokkaido University (1 from 416 patents)


1 patent:

1. 9287514 - Metal complex and device using the metal complex

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as of
12/29/2025
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