Company Filing History:
2 out of 209 
1 out of 27,375 
Years Active: 1994-1997
Title: Koji Harakawa: Innovator in Electrophotography
Introduction
Koji Harakawa, a distinguished inventor based in Shizuoka, Japan, has made significant contributions to the field of electrophotography. With two notable patents to his name, his work focuses on developing advanced toner and developer compositions that enhance image quality and performance in various printing applications.
Latest Patents
Harakawa's most recent patents include a two-component developer and an image-forming method designed to optimize toner recovery. The first patent describes a two-component developer that enables the efficient removal and recovery of toner from a photoconductive drum post-transfer. This innovative developer comprises toner matrix particles containing a binder resin and a colorant, enhanced by magnetic powder adhering to each particle's surface. Additionally, it features a magnetic carrier exhibiting saturation magnetization ranging from 90 to 200 emu/g in a magnetic field of 3,000 oersted.
His second patent focuses on developing novel compositions for electrophotography, specifically tailored to prevent the adherence of ferrite carriers to photoconductors without compromising the image quality. These developing compositions use toners with binding resins and colorants, along with ferrite carriers composed of 5 to 40 mol % of ZnO and 60 to 95 mol % of Fe2O3. These compositions are engineered to maintain a saturated magnetization value between 70 to 100 emu/g in a magnetic field of 3,000 oersted.
Career Highlights
Throughout his career, Koji Harakawa has held pivotal roles in notable companies such as Tomoegawa Paper Co., Inc. and Matsushita Electric Industrial Co., Ltd. His experience in these organizations has profoundly shaped his approach to innovation in the printing technology sector.
Collaborations
Harakawa has collaborated with esteemed coworkers such as Makoto Miura and Takayuki Sano. Their collective expertise has contributed to the success of his inventive endeavors, fostering an environment of creativity and innovation within the field.
Conclusion
Koji Harakawa stands out as a pivotal figure in the realm of electrophotography, with his patents advancing both the quality and efficiency of imaging technologies. His contributions not only reflect his technical acumen but also his commitment to innovation in the industry. As he continues his work, the impact of his inventions is likely to resonate within the printing technology landscape for years to come.