Growing community of inventors

Kyoto, Japan

Masatsune Okuma

Average Co-Inventor Count = 3.43

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

Masatsune Okuma ↔ Sakae Katayama (1 patent)Masatsune Okuma ↔ Sakae Katayama, Deceased (1 patent)Masatsune Okuma ↔ Tadahiko Asano (1 patent)Masatsune Okuma ↔ Keisyo Nakanishi (1 patent)Masatsune Okuma ↔ Keisho Nakanishi (1 patent)Masatsune OkumaMasatsune Okuma (2 patents)Sakae KatayamaSakae Katayama (20 patents)Sakae Katayama, DeceasedSakae Katayama, Deceased (4 patents)Tadahiko AsanoTadahiko Asano (2 patents)Keisyo NakanishiKeisyo Nakanishi (1 patent)Keisho NakanishiKeisho Nakanishi (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Katayama Chemical, Inc. (1 from 20 patents)

2. Katayama Chemical Works Ltd. (1 from 1 patent)


2 patents:

1. 5259985 - Calcium carbonate scale inhibitor having organophosphonate, water

2. 4814406 - Scale inhibitor

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as of
12/14/2025
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