Growing community of inventors

Chigasaki, Japan

Toshihiko Umeda

Average Co-Inventor Count = 2.77

ph-index = 3

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 = 64

Toshihiko Umeda ↔ Hiroshi Yoshikawa (2 patents)Toshihiko Umeda ↔ Takashi Ohwada (2 patents)Toshihiko Umeda ↔ Shingo Hirose (1 patent)Toshihiko Umeda ↔ Shirou Fujimori (1 patent)Toshihiko UmedaToshihiko Umeda (3 patents)Hiroshi YoshikawaHiroshi Yoshikawa (72 patents)Takashi OhwadaTakashi Ohwada (8 patents)Shingo HiroseShingo Hirose (7 patents)Shirou FujimoriShirou Fujimori (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Hitachi, Ltd. (3 from 42,485 patents)


3 patents:

1. D464644 - Telephone exchange equipment

2. D457509 - Telephone

3. D422977 - Electronic exchange

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idiyas.com
as of
12/4/2025
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