Koichi Doi

Title: Innovations of Koichi Doi

Introduction

Koichi Doi is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of material science and semiconductor technology. With a total of 2 patents, his work focuses on innovative solutions for separation processes and semiconductor substrate cleaning.

Latest Patents

One of his latest patents is a membrane for the separation of water-alcohol mixed liquids. This membrane is composed of chitosan with a molecular weight ranging from 80,000 to 150,000 and a deacetylation degree adjusted to 80 to 95%. The membrane exhibits excellent selective permeability to water, making it highly effective in separating water from alcohol mixtures. The preparation process involves dissolving chitosan in an acidic aqueous solution, shaping it into a membrane, and immersing it in an alkaline solution.

Another notable patent involves a process for washing semiconductor substrates with an organic solvent. This process consists of three stages: first, washing the substrate with an organic solvent; second, separating and removing water and impurities from the solvent; and third, recycling the cleaned solvent back to the washing stage. This continuous circulation system enhances the efficiency of the cleaning process.

Career Highlights

Throughout his career, Koichi Doi has worked with notable companies such as Tokuyama Soda and Katokichi Co., Ltd. His experience in these organizations has contributed to his expertise in developing innovative technologies.

Collaborations

Koichi has collaborated with several professionals in his field, including Yasuhiro Kagiyama and Toru Nonaka. These collaborations have further enriched his research and development efforts.

Conclusion

Koichi Doi's contributions to the fields of material science and semiconductor technology are noteworthy. His innovative patents reflect his commitment to advancing technology and improving industrial processes.