Company Filing History:
2 out of 2,899 
1 out of 127 Years Active: 1991-1995
Title: Yukihiro Imura: Innovator in Semiconductor Memory Technology
Introduction
Yukihiro Imura is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of semiconductor memory technology. With a total of 3 patents to his name, his work has had a lasting impact on the industry.
Latest Patents
One of his latest patents is for an optically erasable nonvolatile semiconductor memory. This innovative memory comprises a semiconductor substrate made of N-type silicon, with a pair of source and drain regions that have opposite electroconductivity. These regions are formed in a surface area of the substrate, defining a channel region between them. A gate insulating film is placed on the channel region, along with a floating gate electrode made of N-type polysilicon. This design effectively reduces the thickness of the adjacent gate insulating film to below 500 Å, significantly micronizing the memory dimensions.
Another notable patent involves a non-volatile semiconductor memory with a CVD tunnel oxide. This device features a floating gate electrode that is electrically insulated from the semiconductor substrate for charge storage. A tunnel insulating film is in contact with the floating gate electrode, allowing for the injection and extraction of electric charge through an electric tunnel current. The tunnel insulating film is composed of silicon oxide, chemically vapor-deposited at temperatures between 700°C and 900°C, establishing a breakdown current density exceeding 1.0 A/cm².
Career Highlights
Yukihiro Imura has worked with several notable companies throughout his career, including Seiko Instruments Inc. and Seiko Instruments & Electronics Ltd. His experience in these organizations has contributed to his expertise in semiconductor technology.
Collaborations
He has collaborated with esteemed colleagues such as Masaaki Kamiya and Katsuyuki Takahashi. Their joint efforts have further advanced the field of semiconductor memory.
Conclusion
Yukihiro Imura's innovative work in semiconductor memory technology has established him as a key figure in the industry. His patents reflect a deep understanding of the complexities involved in memory design and functionality. His contributions continue to influence advancements in this critical area of technology.