Growing community of inventors

Tokyo, Japan

Koushi Yamaguchi

Average Co-Inventor Count = 1.26

ph-index = 6

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 = 97

Koushi YamaguchiKoji Nakagawa (2 patents)Koushi YamaguchiKazuaki Kashiwaguma (2 patents)Koushi YamaguchiMitsuru Sugiura (2 patents)Koushi YamaguchiHiroyuki Ishii (1 patent)Koushi YamaguchiKazuyoshi Oshima (1 patent)Koushi YamaguchiShinji Kato (1 patent)Koushi YamaguchiMisao Iwata (1 patent)Koushi YamaguchiHirokazu Watanabe (1 patent)Koushi YamaguchiKenta Naganuma (1 patent)Koushi YamaguchiHisanori Kurobe (1 patent)Koushi YamaguchiYasuyuki Kakita (1 patent)Koushi YamaguchiSugiura Mitsuru (1 patent)Koushi YamaguchiSugiura Mitsuru (0 patent)Koushi YamaguchiKoushi Yamaguchi (21 patents)Koji NakagawaKoji Nakagawa (19 patents)Kazuaki KashiwagumaKazuaki Kashiwaguma (14 patents)Mitsuru SugiuraMitsuru Sugiura (7 patents)Hiroyuki IshiiHiroyuki Ishii (287 patents)Kazuyoshi OshimaKazuyoshi Oshima (42 patents)Shinji KatoShinji Kato (23 patents)Misao IwataMisao Iwata (9 patents)Hirokazu WatanabeHirokazu Watanabe (4 patents)Kenta NaganumaKenta Naganuma (4 patents)Hisanori KurobeHisanori Kurobe (1 patent)Yasuyuki KakitaYasuyuki Kakita (1 patent)Sugiura MitsuruSugiura Mitsuru (1 patent)Sugiura MitsuruSugiura Mitsuru (0 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Sugatsune Kogyo Co., Ltd. (18 from 228 patents)

2. Other (2 from 832,912 patents)

3. Noritake Co., Ltd. (1 from 198 patents)

4. Koushi Yamaguchi (1 from 1 patent)

5. Yamaguchi, Koushi (0 patent)


21 patents:

1. 11541040 - Medicine for improving state of pregnancy, and use thereof

2. 10837210 - Hinge and hinge bracket

3. 10494845 - Door hinge for a door and a door frame

4. D852608 - Hinge

5. 10143682 - Medicine for improving state of pregnancy, and use thereof

6. 10113344 - Stay

7. D818791 - Hinge

8. 9222291 - Toggle type fastener

9. D743772 - Hinge for building

10. 8960387 - Damper position adjusting device

11. 8739468 - Door opening and closing device

12. 8584402 - Door opening/closing system and catch therefor

13. D639136 - Door closer

14. D635435 - Door closer

15. D628458 - Catcher for a door closer

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as of
1/8/2026
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