Location History:
- Tokyo, JP (1982 - 1987)
- Hiromachi, JP (1989)
- Minami-ashigara, JP (1990)
Company Filing History:
3 out of 613 
3 out of 16,458 
Years Active: 1982-1990
Title: Fumio Nakagawa: Innovator in Silver Recovery and Enzyme-Inhibitory Compounds
Introduction
Fumio Nakagawa is a notable inventor based in Tokyo, Japan. He has made significant contributions to the fields of silver recovery and enzyme-inhibitory compounds. With a total of 6 patents to his name, Nakagawa's work has had a considerable impact on both industrial processes and pharmaceutical applications.
Latest Patents
One of Nakagawa's latest patents is a method for recovering silver from photographic processing solutions. This innovative method utilizes electrolysis, where the cathode potential is set to a range that facilitates the formation of silver sulfide precipitates in the electrolytic cell. This approach not only allows for intensive silver recovery but also results in a low concentration of residual silver in the solution. Additionally, the design of the electrolytic apparatus enables easy separation of silver sulfide precipitates. The application of lead peroxide to the anode material enhances its lifespan, while also significantly reducing the chemical oxygen demand (COD) and iron content in the waste solution.
Another significant patent involves enzyme-inhibitory griseolic acid derivatives. Dihydrodesoxygriseolic acid, along with its salts and esters, can be produced by cultivating specific strains of Streptomyces, such as Streptomyces griseoaurantiacus No. 43894. These compounds are known to inhibit the activity of various cyclic nucleotide phosphodiesterases, particularly cAMP PDE, leading to a range of physiological activities and potential uses.
Career Highlights
Throughout his career, Fumio Nakagawa has worked with prominent companies, including Sankyo Company, Limited and Fuji Photo Film Company, Limited. His experience in these organizations has contributed to his expertise in developing innovative solutions in his fields of interest.
Collaborations
Nakagawa has collaborated with notable individuals in his field, including Mitsuo Yamazaki and Kazushige Uenaka. These partnerships have likely enriched his research and development efforts, leading to the successful patents he holds today.
Conclusion
Fumio Nakagawa's contributions to the fields of silver recovery and enzyme-inhibitory compounds demonstrate his innovative spirit and dedication to advancing technology. His patents reflect a commitment to improving industrial processes and exploring new pharmaceutical applications.