Location History:
- Souka, JP (2006 - 2010)
- Koshigaya, JP (2014 - 2015)
- Sapporo, JP (2015)
- Tokyo, JP (1996 - 2018)
Company Filing History:
18 out of 335 
2 out of 1,742 
1 out of 27,375 
Years Active: 1996-2018
Title: Tsukasa Ohnishi: A Pioneer in Lead-Free Solder Alloy Innovations
Introduction
Tsukasa Ohnishi, based in Tokyo, Japan, has made significant contributions to the field of material science, particularly in the development of lead-free solder alloys. With an impressive portfolio of 20 patents, he stands out as an innovative thinker and inventor in the electronics industry.
Latest Patents
Among his latest patents, Tsukasa Ohnishi has developed a Sn-Cu-based lead-free solder alloy, which demonstrates excellent wettability on both copper (Cu) and nickel (Ni) surfaces. This alloy comprises 0.6 to 0.9 mass % of Cu and 0.01 to 0.1 mass % of aluminum (Al), with optional additions of titanium (Ti) and cobalt (Co), making the remainder primarily tin (Sn). In addition, he has patented a lead-free solder alloy designed to minimize electromigration and resistance increases during high current density electric conduction. This specific alloy consists of 1.0-13.0 mass % of indium (In), 0.1-4.0 mass % of silver (Ag), and 0.3-1.0 mass % of copper (Cu), with the remaining composition being tin (Sn). The exceptional tensile properties of this alloy, even at temperatures exceeding 100°C, render it suitable for both CPUs and power semiconductors.
Career Highlights
Tsukasa Ohnishi has spent a considerable portion of his career with notable companies, including Senju Metal Industry Co., Ltd. and Mayo Foundation for Medical Education and Research. His work has primarily focused on enhancing solder materials, which play a crucial role in the reliability and performance of electronic devices.
Collaborations
Throughout his professional journey, Tsukasa Ohnishi has collaborated with distinguished colleagues such as Yoshie Yamanaka and Shunsaku Yoshikawa. These partnerships have facilitated significant advancements in solder technology, contributing to his success as an inventor.
Conclusion
With 20 patents to his name, Tsukasa Ohnishi has established himself as a trailblazer in the development of lead-free solder alloys. His innovative approach addresses critical challenges in the electronics industry, making him a key player in the advancement of reliable solder materials. His continued work promises to influence future technologies, showcasing the importance of innovation in modern manufacturing processes.
Inventor’s Patent Attorneys refers to legal professionals with specialized expertise in representing inventors throughout the patent process. These attorneys assist inventors in navigating the complexities of patent law, including filing patent applications, conducting patent searches, and protecting intellectual property rights. They play a crucial role in helping inventors secure patents for their innovative creations.