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For the Inventor, By the Inventor

Ebina, Japan

Kazuo Takaragi

This inventor holds 67 USPTO granted patents and 2 EPO patents, primarily in Cryptographic Systems (CPC class 380 ). Top assignees: Hitachi, Ltd., Hitachi Chubu Software, Ltd., Hitachi Control Systems, Inc.. Active years: 1989-2010.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Kazuo Takaragi. Retrieved from https://idiyas.com/inventor/kazuo-takaragi

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

USPTO Granted Patents = 67

% Patents Active = 70.1


Average Co-Inventor Count = 3.7

ph-index = 28

Forward Citations = 2,900(Granted Patents)

Forward Citations (Not Self Cited) = 2,868(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Yokohama, JP (1989)
  • Ebuna, JP (2000)
  • Ebinda, JP (2008)
  • Kawasaki, JP (2003 - 2009)
  • Ebina, JP (1990 - 2010)
  • Tokyo, JP (2010)

Company Filing History:

goldMedal65 out of 42,726 
 
Hitachi, Ltd.
 patents
silverMedal5 out of 13 
 
Hitachi Chubu Software, Ltd.
 patents
bronzeMedal3 out of 9 
 
Hitachi Control Systems, Inc.
 patents
4. 2 out of 2 
 
Hitachi Research Institute
 patents
5. 1 out of 39,371 
 
Fujitsu Corporation
 patents
6. 1 out of 2 
 
Tokyo, Japan
 patents
7. 2 out of 834,453 
Other
 patents
where one patent can have more than one assignee

Years Active: 1989-2010

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Areas of Expertise:
Digital Signing
Cryptographic Systems
Symmetric-Key Encryption
Data Authentication
RFID Technology
Semiconductor Devices
Pseudorandom Number Generation
Network Security
Electronic Circuit Chip
Database Management
Data Encryption
IC Card Encryption
67 patents (USPTO):Explore Patents
1. 7770009 - Digital signing method (2010-08-03),
2. 7711714 - Method and a device for sterilizing downloaded files (2010-05-04),
3. 7694126 - Method and system for recovering the validity of cryptographically signed digital data (2010-04-06),
4. 7549208 - Method of mounting electronic circuit chip (2009-06-23),
5. 7447339 - Unique code generating apparatus, method, program and recording medium (2008-11-04),
6. 7359515 - Method and apparatus for symmetric-key decryption (2008-04-15),
7. 7333972 - Database integration management method and apparatus and processing program, medium therefor (2008-02-19),
8. 7330949 - Terminal for use in a system interfacing with storage media (2008-02-12),
9. 7309019 - Method of checking authenticity of sheet with built-in electronic circuit chip (2007-12-18),
10. 7305558 - Digital signing method (2007-12-04),
11. 7298029 - Semiconductor devices and manufacturing method therefor (2007-11-20),
12. 7280659 - Pseudorandom number generating apparatus or encryption or decryption apparatus using the same (2007-10-09),
13. 7224796 - Pseudorandom number generating apparatus or encryption or decryption apparatus using the same (2007-05-29),
14. 7210043 - Trusted computer system (2007-04-24),
15. 7200682 - Time stamp generating system (2007-04-03),

Title: Kazuo Takaragi: Innovator in Digital Security and Network Management

Introduction

Kazuo Takaragi, a prolific inventor based in Ebina, Japan, holds an impressive portfolio of 67 patents. His innovations primarily focus on enhancing digital security and improving network management systems, showcasing the critical role technology plays in today's digital landscape.

Latest Patents

Among his latest innovations, Takaragi developed a digital signing method that ensures the authenticity of digitally signed documents. This invention employs techniques that determine whether a digital signature originates from the actual digital signature generator or if it has been forged by an unauthorized third party. The method offers independent verification of the signer's identity using prior signed messages and time/date stamps, which can be implemented as methods, apparatuses, software, and systems.

Additionally, he has created a method and device for sterilizing downloaded files, which aims to secure computer networks. This system connects multiple computers via transmission lines, utilizing moving type software exclusively employed for security. When a computer transmits a message, it shares the software along with the message, ensuring that the receiving computer executes it by utilizing stored data.

Career Highlights

Kazuo Takaragi’s professional journey includes valuable experience at renowned institutions such as Hitachi, Ltd. and Hitachi Chubu Software, Ltd. His career has been marked by a commitment to technological advancement and innovation in the field of digital security.

Collaborations

Throughout his career, Takaragi has collaborated with notable colleagues, including Ryoichi Sasaki and Hiroshi Yoshiura. Their collective efforts have significantly contributed to advancements in technology and reinforced the importance of collaboration in the field of invention.

Conclusion

Kazuo Takaragi's contributions to digital signing methods and network security exemplify the impact of innovative thinking in technology. With a record of 67 patents, his work not only enhances the security of digital communications but also sets a benchmark for future innovations in the field. Takaragi’s legacy serves as an inspiration for aspiring inventors in the realm of technology.

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]
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