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For the Inventor, By the Inventor

Machida, Japan

Norifumi Nishikawa

This inventor holds 67 USPTO granted patents and 14 published patent applications, primarily in Database Management (CPC class G06F). Top assignees: Hitachi, Ltd., The University of Tokyo, Hitachi Software Engineering Company, Ltd.. Active years: 1998-2026.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Norifumi Nishikawa. Retrieved from https://idiyas.com/inventor/norifumi-nishikawa

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 = 56.7

Average Co-Inventor Count = 3.3

ph-index = 12

Forward Citations = 712(Granted Patents)

Forward Citations (Not Self Cited) = 698(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Amagasaki, JP (1998 - 2001)
  • Nachida, JP (2008)
  • Noda, JP (2010)
  • Machida, JP (2004 - 2014)
  • Santa Clara, CA (US) (2020)
  • Tokyo, JP (2005 - 2024)

Company Filing History:

goldMedal67 out of 42,731 
 
Hitachi, Ltd.
 patents
silverMedal5 out of 1,356 
 
The University of Tokyo
 patents
bronzeMedal1 out of 228 
 
Hitachi Software Engineering Company, Ltd.
 patents
where one patent can have more than one assignee

Years Active: 1998-2026

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Areas of Expertise:
Database Management
Data Processing
Storage Systems
Query Execution
Data Layout
Power Consumption
Monitoring Systems
Fault Management
Data Caching
Abnormal Waveform Detection
Resource Allocation
Multi-Client Systems
67 patents (USPTO):Explore Patents
1. 12554757 - System and method of supporting question answering using large language models (2026-02-17),
2. 12517675 - Data processing apparatus and data processing method (2026-01-06),
3. 12487973 - Update method and database update apparatus (2025-12-02),
4. 12430334 - Database management apparatus and method (2025-09-30),
5. 12153582 - Storage system and data cache method (2024-11-26),
6. 12056129 - Computer system and query processing method (2024-08-06),
7. 11914603 - Data layout model generation system (2024-02-27),
8. 11709839 - Database system and query execution method (2023-07-25),
9. 11669628 - Data management device, data management system, and data management method (2023-06-06),
10. 11321302 - Computer system and database management method (2022-05-03),
11. 11047889 - Monitoring apparatus, monitoring method, and non-transitory recording medium (2021-06-29),
12. 10853365 - Database management system, computer, and database management method (2020-12-01),
13. 10838949 - Shared resource update apparatus and shared resource update method (2020-11-17),
14. 10598702 - Similarity detection of abnormal waveforms using PMU measurement (2020-03-24),
15. 10242053 - Computer and data read method (2019-03-26),

Title: Norifumi Nishikawa: A Pioneer in Database Management Innovations

Introduction

Norifumi Nishikawa, a distinguished inventor from Machida, Japan, holds an impressive portfolio of 63 patents. His work has significantly contributed to the field of database management systems, revolutionizing how data is stored and processed. Nishikawa's inventive spirit and dedication to innovation have made him a key figure in the technology sector.

Latest Patents

Among his latest contributions to technology, two notable patents stand out. The first is a "Storage system and data cache method," which details a sophisticated database management system that optimally reads and executes queries based on identified required columns. This system uses high-speed storage devices to enhance performance by preferentially retrieving data, thereby streamlining the query execution process.

The second patent, a "Computer system and query processing method," focuses on reducing the processing load associated with joining multiple tables using a hash join. This innovation involves the creation of partial bloom filters that manage hash values for joining keys. By integrating these filters, the system efficiently calculates hash values against probe tables, facilitating the rapid generation of joined tables in response to query requests.

Career Highlights

Nishikawa’s career has been marked by significant tenure at reputable organizations. He has made substantial contributions while working at Hitachi, Ltd. and the University of Tokyo. His professional journey showcases a blend of academic and practical applications of his innovative designs in database management.

Collaborations

Throughout his career, Norifumi Nishikawa has collaborated with esteemed colleagues, including Kazuhiko Mogi and Hideomi Idei. These partnerships have fostered an environment of innovation and creativity, resulting in groundbreaking developments in the field of computing and data management.

Conclusion

Norifumi Nishikawa's influential inventions and patents have paved the way for advancements in database management systems. His dedication to innovation and collaboration with other talented professionals exemplify the importance of teamwork in achieving technological breakthroughs. As he continues to push the boundaries of what is possible in data processing, his legacy will undoubtedly inspire future generations of inventors and innovators.

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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