Growing community of inventors

Ibaraki, Japan

Masahisa Koyama

Average Co-Inventor Count = 4.80

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 = 8

Masahisa KoyamaKenichi Ito (2 patents)Masahisa KoyamaTetsuo Kobayashi (2 patents)Masahisa KoyamaYoshinobu Abe (1 patent)Masahisa KoyamaHideo Fujita (1 patent)Masahisa KoyamaHirobumi Matayoshi (1 patent)Masahisa KoyamaTakashi Inoue (1 patent)Masahisa KoyamaMasahisa Koyama (2 patents)Kenichi ItoKenichi Ito (5 patents)Tetsuo KobayashiTetsuo Kobayashi (2 patents)Yoshinobu AbeYoshinobu Abe (5 patents)Hideo FujitaHideo Fujita (2 patents)Hirobumi MatayoshiHirobumi Matayoshi (2 patents)Takashi InoueTakashi Inoue (2 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Hidan Co., Ltd. (2 from 13 patents)


2 patents:

1. 6070725 - Cosmetic container

2. 5749664 - Cosmetic container having an insert sleeve to improve air tightness and

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as of
12/12/2025
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