Growing community of inventors

Yokohama, Japan

Etsujiro Ikeda

Average Co-Inventor Count = 1.33

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 = 9

Etsujiro IkedaNobuhiro Hato (1 patent)Etsujiro IkedaEtsujiro Ikeda (2 patents)Nobuhiro HatoNobuhiro Hato (1 patent)
..
Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Sanyo-Kokusaku Pulp Co., Ltd. (1 from 65 patents)

2. Honshu Seishi Kabushiki Kaisha (1 from 20 patents)

3. Kyokuetsu Cooperation Co., Ltd. (1 from 1 patent)

4. Jyoni Business Forms Co., Ltd. (1 from 1 patent)


2 patents:

1. 5167998 - Postcards and reply postcards for confidential purposes

2. 4801074 - Sealed letter

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as of
1/13/2026
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