For the Inventor, By the Inventor

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Hirakawa Iron Works, Ltd.

USPTO Granted Patents = 3

Forward Citations = 27

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12 inventors (with patents filed for the assignee):

Masamichi Yamamoto (1 out of 18 patents)

Hiroshi Tahara (1 out of 11 patents)

Hiroshi Kobayashi (1 out of 56 patents)

4. Seiji Yoshida (1 out of 7 patents)

5. Yoshiharu Ueda (1 out of 5 patents)

6. Yasuhiko Suesada (1 out of 1 patent)

7. Junichi Sugioka (1 out of 1 patent)

8. Keiryo Tou (1 out of 3 patents)

9. Takashi Moriyama (1 out of 14 patents)

10. Katsuhiko Kaburagi (1 out of 4 patents)

11. Hideyuki Naruwa (1 out of 1 patent)

12. Izumi Mizobuchi (1 out of 1 patent)

3 patents: Sort by Forward Citations

1. 5050541 - Boiler equipped with water tubes (1991-09-24),

2. 5020479 - Watertube boiler and its method of combustion (1991-06-04),

3. 4151874 - Heat exchanger for flue gas (1979-05-01),

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USPTO Data Jan 1 1976 - Jan 6 2026

3 Patents

#835 in Osaka

#8,771 in Japan

Hirakawa Iron Works, Ltd.

Forward Citations = 27

12 inventors:

Masamichi Yamamoto (1 out of 18 patents)

Hiroshi Tahara (1 out of 11 patents)

Hiroshi Kobayashi (1 out of 56 patents)

4. Seiji Yoshida (1 out of 7 patents)

5. Yoshiharu Ueda (1 out of 5 patents)

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