Company Filing History:

14 out of 42,485

Hitachi, Ltd.

patents

1 out of 217

Hitachi Device Engineering Co., Ltd.

patents

where one patent can have more than one assignee

Years Active: 1979-2002

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14 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 6346291 - Method of producing a cathode ray tube (2002-02-12),

2. 6246163 - Cathode ray tube having bismuth oxide layer on color selective electrode (2001-06-12),

3. 5814928 - Cathode ray tube having reduced doming effect (1998-09-29),

4. 5216321 - Shadow-mask type color cathode-ray tube (1993-06-01),

5. 5138461 - Implosion-protected cathode-ray tube (1992-08-11),

6. 4872924 - Method of producing shadow mask of color cathode ray tube (1989-10-10),

7. 4833361 - Impregnated cathode having cathode base body and refractory metal (1989-05-23),

8. 4543441 - Solar battery using amorphous silicon (1985-09-24),

9. 4481265 - Photovoltaic-storage battery device (1984-11-06),

10. 4446404 - Directly heated oxide cathode and production thereof (1984-05-01),

11. 4382206 - Directly heated type oxide cathode (1983-05-03),

12. 4222775 - Base metal plate materials for directly heated oxide cathodes (1980-09-16),

13. 4208208 - Nickel alloy base metal plate for directly heated oxide cathodes (1980-06-17),

14. 4146393 - Base metal plate materials for directly heated oxide cathode (1979-03-27),

Title: Masaharu Kumada: Innovator in Cathode Ray Tube Technology

Introduction

Masaharu Kumada is a notable inventor from Mobara, Japan, recognized for his contributions to the field of cathode ray tube technology. With a total of 14 patents to his name, Kumada has made significant advancements that have impacted the display technology industry.

Latest Patents

Kumada's latest patents include innovative methods for producing cathode ray tubes. One of his notable inventions describes a cathode ray tube that features a panel portion with a phosphor layer on its inner face, a neck portion that houses an electron gun, and a funnel portion that connects the panel to the neck. This design incorporates a color selective electrode assembly with multiple electron beam passing openings positioned opposite the phosphor layer. The assembly is designed to enhance image quality by utilizing an electron beam reflection film made of a bismuth oxide thin film, which has a bulk density ranging from 1 to 9.3 g/cm. This technology allows for the display of high-density and high-resolution images, marking a significant improvement in cathode ray tube performance.

Career Highlights

Throughout his career, Kumada has worked with prominent companies such as Hitachi, Ltd. and Hitachi Device Engineering Co., Ltd. His experience in these organizations has contributed to his expertise in developing advanced display technologies.

Collaborations

Kumada has collaborated with notable coworkers, including Akira Misumi and Noriharu Matsudate, who have also made significant contributions to the field of technology.

Conclusion

Masaharu Kumada's innovative work in cathode ray tube technology has led to advancements that enhance image quality and resolution. His contributions continue to influence the display technology landscape, showcasing the importance of innovation in this field.

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