Yasuo Iijima

This inventor holds 44 USPTO granted patents, primarily in Portable Electronic Devices. Top assignee: Kabushiki Kaisha Toshiba. Active years: 1989-2007.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Yasuo Iijima. Retrieved from https://idiyas.com/inventor/yasuo-iijima

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

USPTO Granted Patents = 44

% Patents Active = 97.7

Average Co-Inventor Count = 1.0

ph-index = 20

Forward Citations = 1,591(Granted Patents)

Location History:

Baba, JP (1991)
Tokyo, JP (1997)
Yokoahama, JP (1998)
Yokohama, JP (1989 - 2007)

Company Filing History:

44 out of 53,262

Kabushiki Kaisha Toshiba

patents

Years Active: 1989-2007

Loading Chart...

Areas of Expertise:

Access Management

IC Cards

Data Transmission

Memory Card

Security Systems

File Management

Data Processing

Multi-Protocols

Mutual Authentication

Data Storage

Cipher Communication

Microcomputer

44 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 7296289 - Setting or changing an access condition for an access management apparatus and method of a portable electronic device (2007-11-13),

2. 5959276 - Issuing customized IC cards of different types (1999-09-28),

3. 5929428 - File managing method requiring a change in key data and IC card device (1999-07-27),

4. 5748915 - Transmission method of changing protocol and data processing apparatus (1998-05-05),

5. 5712881 - Data transmission apparatus selectively using two clock signals (1998-01-27),

6. 5678029 - Memory card available for various formats (1997-10-14),

7. 5644750 - Data storage apparatus having memory area with a predetermined logic type (1997-07-01),

8. 5615381 - Security for a data processing system having multiple distinct program (1997-03-25),

9. 5608902 - File management system for memory card (1997-03-04),

10. 5581708 - Data transmission system using electronic apparatus having a plurality (1996-12-03),

11. 5517014 - File management apparatus for IC card (1996-05-14),

12. 5515532 - File management system for memory card (1996-05-07),

13. 5437028 - File management system with file-size flexibility (1995-07-25),

14. 5414835 - IC card processing system capable of determing send timing between an IC (1995-05-09),

15. 5384454 - Portable electronic apparatus (1995-01-24),

Title: Innovations of Yasuo Iijima: A Leader in Access Management Technology

Introduction

Yasuo Iijima, based in Yokohama, Japan, is a prolific inventor with an impressive portfolio of 44 patents. His work primarily focuses on advancements in access management systems, portable electronic devices, and integrated circuit (IC) card technology. Iijima's innovations are instrumental in enhancing user experience with secure and efficient access control.

Latest Patents

Among his latest contributions, Iijima developed a patent for "Setting or changing an access condition for an access management apparatus and method of a portable electronic device." This invention introduces an access management apparatus that processes command messages to set or change access conditions for data elements. The system includes a checking unit to verify the presence of data elements, alongside a control table that details identification and location information along with access conditions.

In another notable patent, he created an innovative method and apparatus for "Issuing customized IC cards of different types." This technology involves a system that determines the type of IC card connected to the processing apparatus and generates command data accordingly. This process enhances the issuance of various IC cards while ensuring that the functionality aligns with the specific requirements of each card type.

Career Highlights

Yasuo Iijima currently works for Toshiba Corporation, a globally recognized leader in technology and electronics. His contributions have significantly advanced the capabilities of access management systems within portable devices, showcasing his commitment to innovation in technology.

Collaborations

Iijima's work often intersects with that of his esteemed coworker, Katsuhisa Hirokawa. They collaborate on projects that push the boundaries of access management technology, reflecting a shared pursuit of excellence in their field.

Conclusion

Yasuo Iijima stands out as a crucial figure in the realm of technology innovation, with a robust patent portfolio that emphasizes the importance of access management and IC card systems. His contributions not only enhance security and efficiency in electronic devices but also pave the way for future innovations in the industry.

Profile summary based on public USPTO records.

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]