Company Filing History:
4 out of 5,290 
2 out of 522 Years Active: 1985-1996
Title: The Innovations of Shoji Miyaguchi
Introduction
Shoji Miyaguchi is a notable inventor based in Yokohama, Japan. He has made significant contributions to the field of technology, particularly in the area of IC card systems. With a total of 6 patents to his name, his work has had a lasting impact on electronic payment systems.
Latest Patents
One of his latest patents is a method and apparatus for the settlement of accounts by IC cards. This innovation involves an IC card that contains a card information memory area, which includes a master public key, card secret keys, a card public key, a card identification number, and a master digital signature. The IC card terminal also has a memory area with similar information. When the IC card is inserted into the terminal, it sends data to verify its identity. The terminal checks the digital signature and, if valid, exchanges information with the IC card to confirm the current remainder value. This process ensures secure transactions and enables the terminal to provide services based on the card's balance.
Career Highlights
Throughout his career, Shoji Miyaguchi has worked with prominent organizations, including Nippon Telegraph and Telephone Corporation and Nippon Telegraph and Telephone Public Corporation. His experience in these companies has allowed him to develop and refine his innovative ideas in the field of electronic payments.
Collaborations
Miyaguchi has collaborated with notable individuals in his field, including Tatsuaki Okamoto and Ginya Ishiguro. These partnerships have contributed to the advancement of his inventions and the successful implementation of his patents.
Conclusion
Shoji Miyaguchi's contributions to the field of IC card technology demonstrate his innovative spirit and dedication to improving electronic payment systems. His patents continue to influence the industry and pave the way for future advancements.