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Bunka Shutter Co., Ltd.

USPTO Granted Patents = 11

% Expired Patents = 9.1

EPO Patents = 8

Forward Citations = 85

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21 inventors (with patents filed for the assignee):

Shigeo Yamagami (3 out of 3 patents)

Masanori Kobayashi (3 out of 23 patents)

Katsuhiko Murakami (2 out of 30 patents)

4. Kohichi Kondoh (2 out of 2 patents)

5. Kenji Yoshida (1 out of 86 patents)

6. Kazunori Matsuo (1 out of 20 patents)

7. Shoji Takahashi (1 out of 29 patents)

8. Masanari Tetsuya (1 out of 1 patent)

9. Tetsuya Imabayashi (1 out of 1 patent)

10. Takayuki Maeda (1 out of 2 patents)

11. Yasunobu Oshima (1 out of 2 patents)

12. Yasunobu Ohshima (1 out of 2 patents)

13. Tohru Uetake (1 out of 1 patent)

14. Takato Kumagai (1 out of 1 patent)

15. Noriaki Iwase (1 out of 1 patent)

11 patents: Sort by Forward Citations

1. 12276155 - Connecting fitting construction materials and connecting method therefor (2025-04-14),

2. 11746586 - Connecting device for construction materials, connecting structure therefor, and connecting method therefor (2023-09-05),

3. 11746585 - Connection member for construction materials, connecting fitting therefor, connecting structure therefor, and connecting method therefor (2023-09-05),

4. 9810011 - Opening/closing device (2017-11-07),

5. 9670697 - Door device with pressure difference mitigating mechanism (2017-06-06),

6. 6630235 - Bullet-proof glass screen, and bullet-proof glass screen device (2003-10-07),

7. 6065546 - Fire extinguishing and smoke eliminating apparatus and method using (2000-05-23),

8. 5072766 - Panel shutter assembly (1991-12-17),

9. 5065806 - Panel shutter assembly (1991-11-19),

10. 4838331 - Slat opening/closing drive mechanism in shutter equipment (1989-06-13),

11. 4595043 - Shutter device (1986-06-17),

Bunka Shutter Co., Ltd. is a leading manufacturer of high-quality shutters and rolling doors. With over 50 years of experience in the industry, we are committed to providing innovative and durable solutions for commercial and residential properties. Our products are known for their superior craftsmanship and reliability, earning us a reputation as a trusted partner in the construction and architectural sectors.

Profile summary based on public USPTO records.

Company Badge

USPTO Data Jan 1 1976 - Sep 29 2026

11 Patents

#1,802 in Tokyo

#4,131 in Japan

#51,671 in the World

Bunka Shutter Co., Ltd.

Forward Citations = 85

21 inventors:

Shigeo Yamagami (3 out of 3 patents)

Masanori Kobayashi (3 out of 23 patents)

Katsuhiko Murakami (2 out of 30 patents)

4. Kohichi Kondoh (2 out of 2 patents)

5. Kenji Yoshida (1 out of 86 patents)

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