Growing community of inventors

Nagoya, Japan

Shigeo Shirai

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 = 33

Shigeo Shirai ↔ Tatsuro Funahashi (1 patent)Shigeo ShiraiShigeo Shirai (1 patent)Tatsuro FunahashiTatsuro Funahashi (9 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Shachihata Industrial Co., Ltd. (1 from 25 patents)


1 patent:

1. D331940 - Felt-tipped pen

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as of
12/15/2025
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