Location History:
- Kunitachi, JP (1990 - 1996)
- Niigata, JP (1996 - 2001)
- Minato-Ku, JP (2002)
- Ibaraki, JP (2003 - 2011)
- Tokyo, JP (1987 - 2016)
- Ashigarakami-gun, JP (2023 - 2024)
Company Filing History:
19 out of 2,248 
5 out of 1,030 
1 out of 21,351 
Years Active: 1987-2025
Title: **Hiroshi Matsunaga: Innovator in Surface Treatment Technologies**
Introduction
Hiroshi Matsunaga, an accomplished inventor based in Tokyo, Japan, has made significant strides in the field of surface treatment technologies. With an impressive portfolio of 26 patents, Matsunaga is recognized for his innovative solutions aimed at enhancing the properties of stainless steel and semiconductor substrates.
Latest Patents
One of his recent innovations includes an **aqueous composition, method for roughening stainless steel surface in which same is used, roughened stainless steel, and method for manufacturing same**. This patent addresses the challenge of efficiently roughening stainless steel surfaces with minimal steps. The aqueous composition comprises 0.1-20 mass % of hydrogen peroxide, 0.25-40 mass % of copper ions, and 1-30 mass % of halide ions, providing an effective solution for surface treatment.
Additionally, Matsunaga developed an **etchant for selectively etching copper and copper alloy, and method for manufacturing semiconductor substrate using said etchant**. This etchant allows for the selective etching of copper while minimizing the dissolution of nickel, tin, and gold alloys. It contains 5-10.5% by mass of hydrogen peroxide, 0.3-6% by mass of nitric acid, and incorporates nitrogen-containing 5-membered ring compounds, alongside various pH adjusters.
Career Highlights
Hiroshi Matsunaga has an extensive career working with notable companies such as Mitsubishi Gas Chemical Company, Inc. and TEAC Corporation. His contributions to these organizations have propelled advancements in chemical engineering and semiconductor technologies.
Collaborations
Throughout his innovative journey, Matsunaga has had the opportunity to work alongside talented individuals, including his coworkers Kenji Shimada and Kenji Yamada. Their collaborations have fostered a culture of creativity and problem-solving within their teams.
Conclusion
Hiroshi Matsunaga's inventive work continues to inspire advancements in material science and surface treatments. With a focus on efficiency and effectiveness, his patents reflect a commitment to innovation that is likely to leave a lasting impact on the industry.