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For the Inventor, By the Inventor

Kyoto, Japan

Katsuhiko Tsunemitsu

This inventor holds 12 USPTO granted patents. Top assignees: Yamada Chemical Co., Ltd., Nagase Chemicals Ltd.. Active years: 1984-1994.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Katsuhiko Tsunemitsu. Retrieved from https://idiyas.com/inventor/katsuhiko-tsunemitsu

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

USPTO Granted Patents = 12

% Patents Active = 100.0

Average Co-Inventor Count = 3.9

ph-index = 3

Forward Citations = 29(Granted Patents)


Location History:

  • Kyoto, JP (1984 - 1990)
  • Uji, JP (1993 - 1994)

Company Filing History:

goldMedal12 out of 16 
 
Yamada Chemical Co., Ltd.
 patents
silverMedal1 out of 3 
 
Nagase Chemicals Ltd.
 patents
where one patent can have more than one assignee

Years Active: 1984-1994

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12 patents (USPTO):Explore Patents
1. 5286702 - Phthalide compound and recording material using the compound (1994-02-15),
2. 5179066 - Thermosensitive recording material (1993-01-12),
3. 4892973 - Process for producing 1,1-diphenylalkenes (1990-01-09),
4. 4845245 - Process for producing (1989-07-04),
5. 4835291 - Divinyl compounds and chromogenic recording-material prepared by using (1989-05-30),
6. 4820841 - Chromogenic quinoline compounds (1989-04-11),
7. 4814320 - Heat-sensitive recording material (1989-03-21),
8. 4808567 - Divinyl compounds and chromogenic recording-material prepared by using (1989-02-28),
9. 4747875 - Chromogenic azaphthalide compound and a colour-forming recording (1988-05-31),
10. 4598150 - Chromogenic 1-(3-methoxy-4-alkoxyphenyl)-2-(2'-quinolyl)ethylene (1986-07-01),
11. 4564679 - Chromogenic compounds (1986-01-14),
12. 4444591 - Chromogenic compounds and the use thereof as color former in copying or (1984-04-24),

Title: **The Innovative Contributions of Katsuhiko Tsunemitsu**

Introduction

Katsuhiko Tsunemitsu is a notable inventor based in Kyoto, Japan, recognized for his contributions to the field of materials science and recording technology. With a portfolio of 12 patents, his work has significantly impacted the development of innovative recording materials.

Latest Patents

Among Tsunemitsu's latest inventions are two remarkable patents. The first is centered around a phthalide compound and its use as a recording material. This novel compound forms a distinctive blue-black color rapidly when combined with a developer. The color image produced exhibits strong absorption at wavelengths between 700 to 750 nm, facilitating its application in optical character reading systems. The formula includes various chemical groups, enhancing its versatility and effectiveness.

The second significant patent pertains to a thermosensitive recording material containing a durene derivative. This invention allows for the development of a recording layer that reacts with a leuco dye and a color-developing agent, yielding high color sensitivity upon heating. The innovative approach enables the creation of more responsive and efficient thermosensitive materials.

Career Highlights

Katsuhiko Tsunemitsu has worked with prominent companies such as Yamada Chemical Co., Ltd. and Nagase Chemicals Ltd., where he applied his expertise in chemical engineering and materials science to develop advanced recording materials. His contributions in these roles have led to numerous innovations that further enhance the efficiency and functionality of recording technologies.

Collaborations

Throughout his career, Tsunemitsu has collaborated with esteemed colleagues, including Hajime Kawai and Yoshiharu Fujino. Their combined efforts have fostered a collaborative environment that promotes innovation and discovery, resulting in significant advancements in recording materials.

Conclusion

Katsuhiko Tsunemitsu's innovative spirit and dedication to research have led to valuable contributions within the fields of materials science and recording technology. His patents not only reflect his creative capabilities but also serve as a foundation for future advancements in the industry. The impact of his work continues to resonate, influencing the evolution of recording materials and methodologies.

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]
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