Location History:
- Susono, JP (1983 - 1988)
- Suntou-gun, JP (2004)
- Shizuoka, JP (1987 - 2005)
- Shizuoka-ken, JP (1996 - 2005)
- Sunto-gun, JP (2006)
Company Filing History:
10 out of 28,566 
2 out of 39,238 
1 out of 832,843 Years Active: 1983-2006
Title: Hachiro Tosaka: A Pioneer in Toner Innovations
Introduction
Hachiro Tosaka is a notable inventor hailing from Shizuoka, Japan. With a prolific career that has seen him be awarded 12 patents, he has made significant contributions to the field of image processing technology, particularly in the development of toner products.
Latest Patents
Tosaka's latest patents include innovative formulations and applications for black toner. He has developed a toner for developing electrostatic latent images, which comprises toner particles that each contain a black colorant and binder resin. The remarkable aspect of this invention is that the black colorant includes a metal oxide with a number average particle diameter ranging from 20 to 100 nm, constituting 10 to 40% by weight based on the total weight of the toner particles.
Career Highlights
Throughout his career, Hachiro Tosaka has worked at esteemed companies such as Ricoh Company, Ltd. and Fujitsu Corporation. His expertise and innovations have shaped the products and technologies developed by these leading firms in the imaging and electronics sectors.
Collaborations
Tosaka's work is often characterized by collaboration with prominent colleagues, including Masakazu Kinoshita and Takashi Yamamoto. Through these partnerships, he has enhanced the innovative capacity within the realm of toner and image processing technology.
Conclusion
In summary, Hachiro Tosaka stands out as a significant figure in the invention and innovation of toner technology. His contributions not only advance the capabilities of imaging systems but also demonstrate the importance of collaboration in driving technological progress within the industry.