Yuriko Ishitobi

Title: Yuriko Ishitobi: Innovator in Nonvolatile Semiconductor Technology

Introduction

Yuriko Ishitobi is a prominent inventor based in Osaka, Japan. She has made significant contributions to the field of semiconductor technology, particularly in nonvolatile memory devices. With a total of 2 patents to her name, Ishitobi's work has garnered attention for its innovative approaches to data storage and retrieval.

Latest Patents

Ishitobi's latest patents include a nonvolatile semiconductor storage device and a rewriting method thereof. This invention features a bitwise bidirectionally rewritable nonvolatile semiconductor storage device that enables high-speed data rewriting while enhancing the endurance and data-retention characteristics of memory cells. The device employs a logic circuit that corresponds to various change patterns of write conditions. It also compares read-out data from memory at the start of the data rewrite with prepared write data. After an electrical data rewrite, the process verifies the data rewrite based on the stored rewrite-bit information in an internal buffer circuit. This innovative approach protects already-rewritten memory cells from unnecessary additional rewrites.

Another notable patent is the nonvolatile semiconductor memory device, which includes a memory array with a resistive memory cell array. This array features a first cell transistor and a resistance change element connected in series, along with a reference cell array that has a second cell transistor and a resistance element. The design incorporates a dummy memory cell connected to the reference bit line, ensuring efficient operation and reliability.

Career Highlights

Yuriko Ishitobi is currently employed at Panasonic Intellectual Property Management Co., Ltd. Her work at this esteemed company has allowed her to focus on advancing semiconductor technologies. Ishitobi's innovative contributions have positioned her as a key figure in her field.

Collaborations

Ishitobi has collaborated with notable colleagues, including Takanori Ueda and Kazuyuki Kouno. These partnerships have further enriched her research and development efforts in semiconductor technology.

Conclusion

Yuriko Ishitobi's contributions to nonvolatile semiconductor technology exemplify her innovative spirit and dedication to advancing the field. Her patents reflect a commitment to enhancing data storage solutions, making her a significant figure in the world of technology.