Growing community of inventors

Saitama, Japan

Masahiko Iijima

Average Co-Inventor Count = 2.00

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 = 20

Masahiko Iijima ↔ Yoshinobu Okayasu (1 patent)Masahiko IijimaMasahiko Iijima (1 patent)Yoshinobu OkayasuYoshinobu Okayasu (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Tonengeneral Sekiyu K.k. (1 from 15 patents)


1 patent:

1. 6267874 - Hydrotreating catalyst and processes for hydrotreating hydrocarbon oil with the same

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12/16/2025
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