Growing community of inventors

Osaka, Japan

Keiichi Koyama

Average Co-Inventor Count = 2.64

ph-index = 10

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 = 441

Keiichi KoyamaHiroshi Sakaguchi (6 patents)Keiichi KoyamaYoshito Fujii (5 patents)Keiichi KoyamaOsamu Akiyama (3 patents)Keiichi KoyamaKazuo Tsujimoto (2 patents)Keiichi KoyamaSeiji Usami (2 patents)Keiichi KoyamaKazumi Osaka (2 patents)Keiichi KoyamaHajime Shiozawa (2 patents)Keiichi KoyamaTakahisa Yubisui (1 patent)Keiichi KoyamaKouki Fukuda (1 patent)Keiichi KoyamaMitsuo Kawa (1 patent)Keiichi KoyamaKunihiro Ohki (1 patent)Keiichi KoyamaShin Takahashi (1 patent)Keiichi KoyamaKuniyasu Matsumoto (1 patent)Keiichi KoyamaKen Kimata (1 patent)Keiichi KoyamaShigeru Kurozumi (1 patent)Keiichi KoyamaKeiichi Koyama (15 patents)Hiroshi SakaguchiHiroshi Sakaguchi (88 patents)Yoshito FujiiYoshito Fujii (46 patents)Osamu AkiyamaOsamu Akiyama (7 patents)Kazuo TsujimotoKazuo Tsujimoto (27 patents)Seiji UsamiSeiji Usami (21 patents)Kazumi OsakaKazumi Osaka (7 patents)Hajime ShiozawaHajime Shiozawa (6 patents)Takahisa YubisuiTakahisa Yubisui (34 patents)Kouki FukudaKouki Fukuda (22 patents)Mitsuo KawaMitsuo Kawa (9 patents)Kunihiro OhkiKunihiro Ohki (8 patents)Shin TakahashiShin Takahashi (7 patents)Kuniyasu MatsumotoKuniyasu Matsumoto (5 patents)Ken KimataKen Kimata (4 patents)Shigeru KurozumiShigeru Kurozumi (4 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Sharp Kabushiki Kaisha Corporation (9 from 25,577 patents)

2. Sharp Corporation (6 from 847 patents)


15 patents:

1. D415757 - Digital audio disk recorder

2. D413107 - Electronic computer

3. D373583 - Television set

4. D371552 - Combined television set and video tape recorder

5. D369596 - Television set

6. D357245 - Television set

7. D351156 - Television set

8. D318064 - Interface with printer for computer

9. D317777 - Electronic calculator

10. D315572 - Electronic calculator with printer

11. D315358 - Electronic calculator with printer

12. D310235 - Typewriter

13. D309626 - Electronic calculator

14. D303955 - Pocket computer

15. D303523 - Portable computer

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as of
1/8/2026
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