Company Filing History:

12 out of 328

Hodogaya Chemical Co., Ltd.

where one patent can have more than one assignee

Years Active: 1984-2003

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12 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 6552211 - Zirconium compound and electrophotographic toner employing it (2003-04-22),

2. 6410198 - Zirconium compound and electrophotographic toner employing it (2002-06-25),

3. 6110634 - Electrophotographic toner (2000-08-29),

4. 5883232 - Hydrophobic cationic dyes and thermal transfer ink ribbons using the same (1999-03-16),

5. 5834600 - Hydrophobic cationic dyes and thermal transfer ink ribbons using the same (1998-11-10),

6. 5693445 - Electrostatic image developing toner (1997-12-02),

7. 5645967 - Charge controlling agent composition and toner containing said (1997-07-08),

8. 5641884 - Spiro-naphtho-oxazine compound and photosensitive materials using the (1997-06-24),

9. 5164283 - Electrophotographic developing powder (1992-11-17),

10. 4977249 - Metal of hydroxy-phenylaze and hydroxy-naphthylazo compounds as near-red (1990-12-11),

11. 4624907 - Electrophotographic toner containing metal complex (1986-11-25),

12. 4433040 - Electrophotographic toner containing a metal complex dye (1984-02-21),

Title: Hiroyoshi Yamaga: Innovator in Electrophotographic Technologies

Introduction: Hiroyoshi Yamaga is a distinguished inventor based in Tokyo, Japan, known for his contributions to the field of electrophotographic technologies. With a total of 12 patents to his name, Yamaga has made significant advancements that impact various industries, particularly in the realm of printing and imaging.

Latest Patents: Among his notable inventions is a groundbreaking novel zirconium compound that serves as a charge control agent in electrophotographic toners. This invention highlights the utility of the zirconium compound, enhancing the performance and efficiency of electrophotographic processes. His recent patents reflect a commitment to innovation within the sector, showcasing Yamaga's ability to combine chemistry with technology.

Career Highlights: Hiroyoshi Yamaga has worked with reputable organizations such as Hodogaya Chemical Co., Ltd. and Sony Corporation, where he has honed his skills and developed his inventive ideas. His tenure at these companies allowed him to gain valuable experience and recognition within the industry.

Collaborations: Throughout his career, Yamaga has collaborated with prominent individuals, including Noboru Akuzawa and Nobuo Suzuki. These partnerships have fostered an environment of creativity and innovation, contributing to the successful development of his inventions.

Conclusion: Hiroyoshi Yamaga's contributions to the field of electrophotography underline his status as a key inventor in Japan. With his innovative zirconium compound and a dedicated career in collaboration with leading companies, he continues to influence the landscape of technology and invention within the industry.

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