Growing community of inventors

Yokohama, Japan

Hiroshi Ohtsuka

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 = 0

Hiroshi Ohtsuka ↔ Takahisa Umezawa (2 patents)Hiroshi OhtsukaHiroshi Ohtsuka (3 patents)Takahisa UmezawaTakahisa Umezawa (3 patents)
..
Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Graph-tech, Inc. (3 from 5 patents)


3 patents:

1. D1104140 - Cutting plotter

2. D1104142 - Cutting plotter

3. D1104141 - Cutting plotter

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as of
12/16/2025
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