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Keiwa Inc.

USPTO Granted Patents = 59

EPO Patents = 6

Trademarks = 13

Forward Citations = 157

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36 inventors (with patents filed for the assignee):

Motohiko Okabe (12 out of 24 patents)

Kenichi Harada (11 out of 20 patents)

Takahiro Tsuji (11 out of 19 patents)

4. Chengheng Tsai (10 out of 10 patents)

5. Yoshitada Namikawa (7 out of 7 patents)

6. Yuki Matsuno (6 out of 6 patents)

7. Chengheng Tsai (5 out of 5 patents)

8. Masayuki Sukigara (5 out of 6 patents)

9. Hironori Nakashima (5 out of 5 patents)

10. Tadayoshi Fukuda (4 out of 4 patents)

11. Satoshi Shiba (3 out of 3 patents)

12. Tadayuki Nonaka (3 out of 3 patents)

13. Akira Furuta (3 out of 18 patents)

14. Hirohisa Dejima (2 out of 2 patents)

15. Akira Arakawa (2 out of 2 patents)

Core Competencies:

Light Diffusion Sheet

Backlight Unit

Liquid Crystal Display Device

Optical Sheet Laminate

Protective Film

Optical Waveguide Sheet

View Angle-Restricting Sheet

Display Device

Concrete Block

Turning Film

Image Display Unit

Multilayer Light Diffusers

59 patents: Sort by Forward Citations

1. 12510783 - Light diffusion sheet, backlight unit, liquid crystal display device, and information equipment (2025-12-30),

2. 12393078 - Light diffusion sheet, light diffusion sheet laminate, backlight unit, and liquid crystal display device (2025-08-19),

3. 12371378 - Structure protection sheet, concrete block, and method for manufacturing reinforced structure (2025-07-29),

4. 12345980 - Optical sheet laminate, backlight unit, liquid crystal display device, information equipment, and production method for backlight unit (2025-07-01),

5. 12313935 - Light diffusion sheet, back-light unit, liquid crystal display device, information apparatus, and method for manufacturing back-light unit (2025-05-27),

6. 12292648 - Optical sheet, backlight unit, liquid crystal display device, and information device (2025-05-06),

7. 12197073 - Optical sheet laminate, backlight unit, liquid crystal display device, information equipment, and production method for backlight unit (2025-01-14),

8. 12174489 - Optical sheet laminate, backlight unit, liquid crystal display device, information equipment, and production method for backlight unit (2024-12-24),

9. 12135479 - Optical sheet laminate, backlight unit, liquid crystal display device, information equipment, and production method for backlight unit (2024-11-05),

10. 12105378 - Light diffusion sheet, backlight unit, liquid crystal display device, information apparatus, and method for manufacturing light diffusion sheet (2024-10-01),

11. 12105376 - Optical sheet, backlight unit, liquid crystal display apparatus, and information device (2024-10-01),

12. 12085807 - Optical sheet laminate, backlight unit, liquid crystal display device, information equipment, and production method for backlight unit (2024-09-10),

13. 11966117 - Optical sheet, backlight unit, liquid crystal display apparatus, and information device (2024-04-23),

14. 11886075 - Optical sheet, backlight unit, liquid crystal display device, and information device (2024-01-30),

15. 11493803 - Display device and light-diffusing sheet stacked body (2022-11-08),

KEIWA INC. is a global technology company specializing in the development and manufacturing of innovative electronic devices. With a focus on delivering cutting-edge solutions that enhance the way people live, work, and connect, KEIWA INC. has established itself as a leader in the industry. From smartphones and tablets to smart home systems and wearables, our products are designed to seamlessly integrate into the modern lifestyle. With a strong commitment to customer satisfaction and continuous innovation, KEIWA INC. is constantly pushing boundaries to shape the future of technology.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Dec 30 2025

59 Patents

#637 in Tokyo

#1,512 in Japan

#11,836 in the World

Keiwa Inc.

Forward Citations = 157

36 inventors:

Motohiko Okabe (12 out of 24 patents)

Kenichi Harada (11 out of 20 patents)

Takahiro Tsuji (11 out of 19 patents)

4. Chengheng Tsai (10 out of 10 patents)

5. Yoshitada Namikawa (7 out of 7 patents)

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