Location History:
- Mitaka, JP (1987 - 1988)
- Hamura, JP (1997)
- Akishima, JP (1992 - 1998)
Company Filing History:
8 out of 42,508 
5 out of 182 
1 out of 87 
Years Active: 1987-1998
Title: Innovations of Yoshihisa Koyama
Introduction
Yoshihisa Koyama is a prominent inventor based in Akishima, Japan. He has made significant contributions to the field of semiconductor technology, holding a total of eight patents. His work focuses on improving the efficiency and functionality of semiconductor memory devices.
Latest Patents
One of his latest patents is a semiconductor memory device with an improved substrate arrangement. This device is designed to accommodate a large number of types of DRAMs with varying package specifications, bit structures, and operating modes. The bonding pads are strategically arranged to optimize the different package types, while various layout arrangements minimize space and enhance access time. Additionally, the patent includes features such as improved output buffer circuitry, protection circuitry, and testing methods to facilitate the operation of the semiconductor memory device. Another notable patent is for a semiconductor memory system that includes a defect remedy LSI mounted on a memory module. This system captures address and control signals and features a redundancy remedy RAM portion composed of static RAM, which enhances the reliability of memory devices.
Career Highlights
Yoshihisa Koyama has worked with notable companies in the semiconductor industry, including Hitachi, Ltd. and Hitachi VLSI Engineering Corporation. His experience in these organizations has contributed to his expertise in semiconductor technology and innovation.
Collaborations
Throughout his career, Koyama has collaborated with talented individuals such as Masaya Muranaka and Hidetomo Aoyagi. These collaborations have likely enriched his work and led to advancements in semiconductor memory technology.
Conclusion
Yoshihisa Koyama's contributions to semiconductor technology through his innovative patents and collaborations highlight his significant role in advancing the field. His work continues to influence the development of efficient and reliable memory devices.