Location History:
- Hachioji, JA (1976 - 1977)
- Hachioji, JP (1978 - 2004)
- Tokyo, JP (1984 - 2011)
Company Filing History:
18 out of 2,528 
3 out of 18 
2 out of 1,156 
Years Active: 1976-2011
Title: Innovations in Glass Polarization: The Contributions of Toshiharu Yamashita
Introduction: Toshiharu Yamashita, based in Hachioji, Japan, is a prolific inventor with an impressive portfolio of 22 patents. His work has significantly advanced the field of glass technology, particularly in the area of polarizers, which are critical components in various optical applications.
Latest Patents: Among his recent innovations are two notable patents focusing on glass polarizers and their manufacturing methods. The first patent outlines a glass polarizer with superior light transmittance and extinction ratio, particularly for visible light, including blue. This invention utilizes silver halide containing glass as a starting material, employing a manufacturing method that involves the reduction of silver halide particles into metallic silver through heat treatment, ultimately yielding an oriented and stretched polarizing glass.
The second recent patent presents a polarizing glass made up of geometrically anisotropic particles that are evenly dispersed in an oriented manner on the surface of a glass base body. This glass composition consists of weight percentages of SiO2, B2O3, Al2O3, ZrO2, and certain alkali and alkaline earth metal oxides along with silver and halide compounds. The resulting polarizing glass has a wide range of applications in optical products, including optical isolators.
Career Highlights: Throughout his career, Toshiharu Yamashita has made significant contributions to the optical glass industry while working for esteemed companies such as Hoya Corporation and Hoya Glass Works, Ltd. His innovative spirit has led to advancements that benefit various technological applications.
Collaborations: Yamashita has collaborated with several notable professionals in the field, including Tetsuro Izumitani and Kiyotaka Miura. Their combined expertise has undoubtedly fostered innovation and research within the field of glass technology.
Conclusion: Toshiharu Yamashita’s inventions and patents represent significant progress in the realm of glass polarizers, contributing not only to the scientific community but also to industrial advancements in optical technologies. His dedication to innovation continues to pave the way for future developments in this critical area of study.
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.