Location History:
- Amimachi, JP (1979)
- Ibaraki, JP (1979)
- Yokkaichi, JP (1986 - 1994)
- Mie, JP (1995 - 1996)
Company Filing History:
9 out of 546 
2 out of 2,346 
1 out of 36,499 
Years Active: 1979-1996
Title: **Masuzo Yokoyama: A Pioneer in Aromatic Polycarbonate Innovations**
Introduction
Masuzo Yokoyama is an esteemed inventor based in Yokkaichi, Japan. With a remarkable portfolio of 11 patents, Yokoyama has significantly contributed to the field of polymer chemistry, particularly the development of aromatic polycarbonates. His work not only showcases his inventive prowess but also his commitment to enhancing material properties for various industrial applications.
Latest Patents
Among his latest innovations, Yokoyama has developed a process for producing aromatic polycarbonate that involves the melt-polycondensation of an aromatic diol compound with a diaryl carbonate compound. This process utilizes an interesterification catalyst comprising a quaternary phosphonium salt compound, thus ensuring the efficient synthesis of high-performance materials. Another notable patent by Yokoyama pertains to producing aromatic polycarbonate with a weight average molecular weight of 7,000 to 60,000 through a melt polycondensation method. This method employs both an alkali metal compound and a phosphonium hydroxide compound as catalysts, resulting in products with enhanced heat resistance and improved hue.
Career Highlights
Yokoyama has demonstrated his expertise while working with significant companies in the industry. Notably, he contributed his talents to Mitsubishi Petrochemical Company Limited and Mitsubishi Chemical Corporation. His innovative approaches have played a crucial role in advancing the applications of aromatic polycarbonates in various sectors.
Collaborations
Throughout his career, Masuzo Yokoyama has collaborated with talented individuals including Junji Takano and Shinichi Yamauchi. These partnerships have not only facilitated the exchange of ideas but have also led to breakthroughs in the field of polymer science.
Conclusion
Masuzo Yokoyama stands out as a key figure in the development of aromatic polycarbonates, with a strong patent portfolio that speaks to his inventive capabilities. His collaborations and associations with prominent companies highlight his expertise and dedication to innovation. As the field of polymer chemistry continues to evolve, Yokoyama's contributions will undoubtedly leave a lasting impact.
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.