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For the Inventor, By the Inventor

Tsuzuki, Japan

Hajime Kawai

This inventor holds 9 USPTO granted patents. Top assignees: Yamada Chemical Co., Ltd., Nagase Chemicals Ltd.. Active years: 1984-1994.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Hajime Kawai. Retrieved from https://idiyas.com/inventor/hajime-kawai

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

USPTO Granted Patents = 9

% Patents Active = 100.0

Average Co-Inventor Count = 3.9

ph-index = 3

Forward Citations = 22(Granted Patents)


Location History:

  • Jyoyo, JP (1984)
  • Tsuzuki, JP (1986 - 1994)

Company Filing History:

goldMedal9 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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9 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. 4845245 - Process for producing (1989-07-04),
4. 4835291 - Divinyl compounds and chromogenic recording-material prepared by using (1989-05-30),
5. 4814320 - Heat-sensitive recording material (1989-03-21),
6. 4808567 - Divinyl compounds and chromogenic recording-material prepared by using (1989-02-28),
7. 4747875 - Chromogenic azaphthalide compound and a colour-forming recording (1988-05-31),
8. 4564679 - Chromogenic compounds (1986-01-14),
9. 4444591 - Chromogenic compounds and the use thereof as color former in copying or (1984-04-24),

Title: **Hajime Kawai: Innovator in Recording Materials**

Introduction

Hajime Kawai is a notable inventor based in Tsuzuki, Japan, known for his significant contributions to the field of recording materials. With an impressive portfolio of 9 patents, Kawai has dedicated his career to developing innovative solutions that enhance imaging technologies and recording capabilities.

Latest Patents

Among his latest inventions, Kawai has developed a novel phthalide compound that serves as a recording material. This compound excels in producing a striking blue-black color with a developer, making it suitable for optical character recognition. The chemical formula of this compound allows it to form intense color images, which are useful for various applications, notably in communication and data transmission technologies. Additionally, his thermosensitive recording material utilizes a durene derivative to create high color sensitivity, achieved through a reactive leuco dye and a color-developing agent that activates upon heating.

Career Highlights

Throughout his career, Hajime Kawai has worked with prominent companies in the chemicals sector, including Yamada Chemical Co., Ltd. and Nagase Chemicals Limited. These experiences have equipped him with the knowledge and skills necessary to innovate and lead in his field, culminating in his numerous patents and inventions that push the boundaries of existing technology.

Collaborations

Kawai has collaborated with notable professionals in the industry, such as Katsuhiko Tsunemitsu and Yoshiharu Fujino. Their joint efforts have helped to refine and expand the scope of Kawai's inventions, showcasing the importance of teamwork in the advancement of technological innovations.

Conclusion

Hajime Kawai stands out as a prominent figure in the realm of innovative recording materials. His contributions, embodied in his patented inventions, reflect a deep commitment to advancing technology. With ongoing research and development, Kawai continues to pave the way for future innovations in the field.

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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