Location History:
- Shimonoseki, JP (1988)
- Takehara, JP (1991 - 1992)
- Yamaguchi, JP (2001 - 2002)
Company Filing History:
4 out of 817 
1 out of 151 Years Active: 1988-2002
Title: The Innovations of Yoshinobu Nakamura
Introduction
Yoshinobu Nakamura is a notable inventor based in Takehara, Japan. He has made significant contributions to the field of materials science, particularly in the development of copper fine powder. With a total of 5 patents to his name, his work has garnered attention for its innovative approaches and practical applications.
Latest Patents
One of his latest patents focuses on a method for preparing copper fine powder. This copper fine powder exhibits an electrical resistance in its powdery state of not more than 1×10 Ω·cm. It has a BET specific surface area ranging from 0.15 to 0.3 m²/g and a tap density of not less than 4.5 g/cc. The product of the tap density and the particle size is not less than 13, with the particle size being calculated from the specific surface area. The particle size distribution observed in the microtrack measurement is expressed in terms of D and D, ranging from 4 to 7 µm and 9 to 11 µm, respectively. Additionally, the weight loss through hydrogen-reduction is not more than 0.30%. The preparation method involves adding an alkali hydroxide to an aqueous copper salt solution containing divalent copper ions maintained at not less than 55°C. This process includes gradually adding a reducing sugar while maintaining the temperature, followed by filtration, washing, and the addition of a hydrazine reducing agent to reduce cuprous oxide to metal copper.
Career Highlights
Yoshinobu Nakamura has worked with prominent companies in the industry, including Mitsui Mining & Smelting Company, Ltd. and Mitsui Kinzoku Kogyo Kabushiki Kaisha. His experience in these organizations has contributed to his expertise in materials development and innovation.
Collaborations
Some of his notable coworkers include Takao Hayashi and Hiroyuki Shimamura. Their collaborative efforts have likely played a role in advancing their shared goals in research and development.
Conclusion
Yoshinobu Nakamura's contributions to the field of materials science, particularly through his innovative work on copper fine powder, highlight his role as a significant inventor. His patents and collaborations reflect a commitment to advancing technology and materials for various applications.