Koji Hagiwara

This inventor holds 7 USPTO granted patents. Top assignees: Hitachi, Ltd., Hitachi Electronic Device Co., Ltd., Other. Active years: 2000-2004.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Koji Hagiwara. Retrieved from https://idiyas.com/inventor/koji-hagiwara-gye9oktr

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

Calculating rank

USPTO Granted Patents = 7

% Patents Active = 57.1

Average Co-Inventor Count = 2.7

ph-index = 2

Forward Citations = 11(Granted Patents)

Location History:

Mobara, JP (2000 - 2002)
Chosei, JP (2002)
Choseimura, JP (2004)

Company Filing History:

Hitachi Electronic Device Co., Ltd.

patent

5 out of 834,659

Other

patents

where one patent can have more than one assignee

Years Active: 2000-2004

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7 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 6707242 - Color cathode ray tube (2004-03-16),

2. 6501214 - Color cathode ray tube (2002-12-31),

3. 6465942 - Color cathode ray having a shadow mask structure with curl reduced in a skirt portion thereof (2002-10-15),

4. 6437497 - Color cathode ray tube having an improved shadow mask (2002-08-20),

5. 6274974 - Color cathode ray tube having an improved shadow mask structure (2001-08-14),

6. 6255765 - Color cathode ray tube having a shadow mask structure with curl reduced in a skirt portion thereof (2001-07-03),

7. 6111346 - Color cathode ray tube having shadow mask structure with curl reduced in (2000-08-29),

Title: Koji Hagiwara: Innovator in Color Cathode Ray Tube Technology

Introduction

Koji Hagiwara is a notable inventor based in Mobara, Japan. He has made significant contributions to the field of display technology, particularly in the development of color cathode ray tubes. With a total of 7 patents to his name, Hagiwara's work has had a lasting impact on the industry.

Latest Patents

Hagiwara's latest patents focus on advancements in color cathode ray tube technology. One of his inventions provides a color cathode ray tube that utilizes a shadow mask designed to avoid ruptures or cracks during press-working. This innovative shadow mask features an apertured region with color-selecting apertures and an unapertured region that surrounds it. Additionally, the skirt portion is bent from the unapertured region in the direction of the tube axis, and the mask includes at least two inclined surfaces at the boundary between the unapertured region and the skirt portion. Another patent addresses the reduction of warp amounts caused by spring back after shaping a shadow mask. This design suppresses deformation of the main surface of the shadow mask after it is secured to a mask frame. The color cathode ray tube includes tongue portions protruding from the distal ends of the skirt portions, with a plurality of stress absorption holes formed in these tongue portions.

Career Highlights

Throughout his career, Koji Hagiwara has worked with prominent companies, including Hitachi, Ltd. His expertise in display technology has positioned him as a key figure in the development of innovative solutions in the industry.

Collaborations

Hagiwara has collaborated with notable individuals in his field, including Hiroshi Ito and Nobuhiko Hosotani. These collaborations have contributed to the advancement of technology in color cathode ray tubes.

Conclusion

Koji Hagiwara's contributions to the field of color cathode ray tubes demonstrate his innovative spirit and technical expertise. His patents reflect a commitment to improving display technology, making him a significant figure in the industry.

Profile summary based on public USPTO records.

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]