Location History:
- Ageo, JP (2006)
- Saitama, JP (2014)
- Tokyo, JP (2013 - 2015)
Company Filing History:
5 out of 817 
1 out of 4 
1 out of 929 Years Active: 2006-2015
Title: Sakiko Tomonaga: Innovator in Copper Foil Technology
Introduction
Sakiko Tomonaga is a prominent inventor based in Tokyo, Japan. She has made significant contributions to the field of materials science, particularly in the development of advanced copper foil technologies. With a total of five patents to her name, her work has had a substantial impact on various industries.
Latest Patents
One of her latest patents focuses on a surface-treated copper foil. The objective of this invention is to provide a copper foil that exhibits excellent softening resistance performance, which minimizes the decrease in tensile strength after heat treatment at temperatures ranging from 350°C to 400°C. This innovation includes a rust-proofing treatment layer made of zinc alloy on both surfaces of the copper foil. The treatment layer contains a specific zinc amount and incorporates small amounts of elements such as carbon, sulfur, chlorine, and nitrogen.
Another notable patent involves an electrodeposited copper foil and its manufacturing method. This invention aims to produce an electrodeposited copper foil with a lower profile and higher gloss compared to conventional products. The electrodeposited copper foil features a super low profile with a surface roughness of less than 1.0-micron meter and a gloss measurement of not lower than 400, regardless of its thickness. The manufacturing method utilizes a sulfuric acid-based copper electrolytic solution enhanced with specific additives.
Career Highlights
Sakiko has worked with notable companies such as Mitsui Mining & Smelting Company, Ltd. and Nippon Stainless Steel Kozai Co., Ltd. Her experience in these organizations has allowed her to refine her expertise in materials engineering and innovation.
Collaborations
Throughout her career, Sakiko has collaborated with esteemed colleagues, including Makoto Dobashi and Mitsuyoshi Matsuda. These partnerships have contributed to her success and the advancement of her inventions.
Conclusion
Sakiko Tomonaga is a trailblazer in the field of copper foil technology, with a focus on enhancing performance and durability. Her innovative patents and career achievements reflect her dedication to advancing materials science. Her contributions continue to influence the industry and inspire future innovations.