For the Inventor, By the Inventor

Enter assignee name

Keiwa Inc.

USPTO Granted Patents = 66

% Expired Patents = 7.6

EPO Patents = 13

Trademarks = 12

Forward Citations = 161

Loading Chart...

Loading Chart...

41 inventors (with patents filed for the assignee):

Chengheng Tsai (14 out of 14 patents)

Motohiko Okabe (13 out of 25 patents)

Kenichi Harada (11 out of 20 patents)

4. Takahiro Tsuji (11 out of 19 patents)

5. Masayuki Sukigara (7 out of 8 patents)

6. Yoshitada Namikawa (7 out of 7 patents)

7. Yuki Matsuno (6 out of 6 patents)

8. Chengheng Tsai (5 out of 5 patents)

9. Hironori Nakashima (5 out of 5 patents)

10. Akira Furuta (5 out of 20 patents)

11. Tadayoshi Fukuda (4 out of 4 patents)

12. Satoshi Shiba (3 out of 3 patents)

13. Tadayuki Nonaka (3 out of 3 patents)

14. Hirohisa Dejima (2 out of 2 patents)

15. Akira Arakawa (2 out of 2 patents)

Core Competencies:

Backlight Unit

Optical Sheet

Light Diffusion Sheet

Liquid Crystal Display

Display Device

Protective Film

Diffusion Plate

Optical Waveguide

66 patents: Sort by Forward Citations

1. 12748329 - Light diffusion sheet, back-light unit, liquid crystal display device, information apparatus, and method for manufacturing back-light unit (2026-09-29),

2. 12742985 - Light diffusion sheet, backlight unit, liquid crystal display apparatus, information device, and method of manufacturing light diffusion sheet (2026-09-22),

3. 12730342 - Optical sheet, backlight unit, liquid crystal display apparatus, and information device (2026-09-08),

4. 12724178 - Light diffusion sheet, backlight unit, liquid crystal display device, information apparatus, and method for manufacturing light diffusion sheet (2026-09-01),

5. 12704752 - Optical sheet laminate, backlight unit, liquid crystal display device, information equipment, and production method for backlight unit (2026-08-11),

6. 12625401 - Light diffusion sheet, back-light unit, liquid crystal display device, information apparatus, and method for manufacturing back-light unit (2026-05-12),

7. 12535706 - Optical sheet laminate, backlight unit, liquid crystal display device, information equipment, and production method for backlight unit (2026-01-27),

8. 12510783 - Light diffusion sheet, backlight unit, liquid crystal display device, and information equipment (2025-12-30),

9. 12393078 - Light diffusion sheet, light diffusion sheet laminate, backlight unit, and liquid crystal display device (2025-08-19),

10. 12371378 - Structure protection sheet, concrete block, and method for manufacturing reinforced structure (2025-07-29),

11. 12345980 - Optical sheet laminate, backlight unit, liquid crystal display device, information equipment, and production method for backlight unit (2025-07-01),

12. 12313935 - Light diffusion sheet, back-light unit, liquid crystal display device, information apparatus, and method for manufacturing back-light unit (2025-05-27),

13. 12292648 - Optical sheet, backlight unit, liquid crystal display device, and information device (2025-05-06),

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

15. 12174489 - Optical sheet laminate, backlight unit, liquid crystal display device, information equipment, and production method for backlight unit (2024-12-24),

Company Overview

Keiwa Inc., based in Osaka, Japan, specializes in the development and manufacturing of advanced backlight unit technology. The company focuses on creating high-performance optical sheets, light diffusion sheets, and protective films that enhance the functionality and visual quality of liquid crystal displays and other display devices. With a commitment to innovation, Keiwa plays a significant role in the display technology sector, providing solutions that improve light management and overall display performance.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

66 Patents

#155 in Osaka

#1,459 in Japan

#11,177 in the World

Keiwa Inc.

Forward Citations = 161

41 inventors:

Chengheng Tsai (14 out of 14 patents)

Motohiko Okabe (13 out of 25 patents)

Kenichi Harada (11 out of 20 patents)

4. Takahiro Tsuji (11 out of 19 patents)

5. Masayuki Sukigara (7 out of 8 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Keiwa Inc.. Retrieved from https://idiyas.com/company/keiwa

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]

Loading…