logo

For the Inventor, By the Inventor

Hyogo, Japan

Natsuo Ajika

This inventor holds 70 USPTO granted patents and 1 published patent application, primarily in Nonvolatile Memory Devices (CPC class 2573). Top assignees: Mitsubishi Denki Kabushiki Kaisha, Genusion, Inc., Hitachi Ulsi Engineering Corp.. Active years: 1991-2015.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Natsuo Ajika. Retrieved from https://idiyas.com/inventor/natsuo-ajika

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

USPTO Granted Patents = 70 

% Patents Active = 77.1

Average Co-Inventor Count = 3.1

ph-index = 21

Forward Citations = 1,467(Granted Patents)

Forward Citations (Not Self Cited) = 1,432(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Itami, JP (1994)
  • Hyogo-ken, JP (1996 - 1999)
  • Tokyo, JP (2003 - 2005)
  • Amagasaki, JP (2008 - 2012)
  • Hyogo, JP (1991 - 2015)

Company Filing History:

goldMedal54 out of 21,351 
 
Mitsubishi Denki Kabushiki Kaisha
 patents
silverMedal15 out of 17 
 
Genusion, Inc.
 patents
bronzeMedal1 out of 87 
 
Hitachi Ulsi Engineering Corp.
 patents
4. 1 out of 42,726 
 
Hitachi, Ltd.
 patents
5. 1 out of 3,781 
 
Renesas Technology Corp.
 patents
where one patent can have more than one assignee

Years Active: 1991-2015

Loading Chart...
Areas of Expertise:
Nonvolatile Memory
Semiconductor Device
Memory Cell
Manufacturing Method
High-Speed Operation
Capacitive Coupling
Trench Isolation
Stacked Capacitors
Electrically Programmable
Field Effect Transistor
Charge Pump
Sub-board Package
70 patents (USPTO):Explore Patents
1. 8964463 - Read disturb control in a nonvolatile semiconductor memory device having P-type memory cell transistor (2015-02-24),
2. 8897077 - Nonvolatile semiconductor memory device (2014-11-25),
3. 8687455 - Nonvolatile semiconductor memory (2014-04-01),
4. 8492826 - Non-volatile semiconductor memory device and manufacturing method thereof (2013-07-23),
5. 8107300 - Non-volatile semiconductor memory device comprising capacitive coupling program inhibit circuitry (2012-01-31),
6. 8106443 - Non-volatile semiconductor memory device (2012-01-31),
7. 8044498 - Interposer, semiconductor chip mounted sub-board, and semiconductor package (2011-10-25),
8. 8017994 - Nonvolatile semiconductor memory (2011-09-13),
9. 8000137 - Nonvolatile semiconductor memory device and usage method thereof (2011-08-16),
10. 7924615 - Nonvolatile semiconductor memory device (2011-04-12),
11. 7723835 - Semiconductor device package structure (2010-05-25),
12. 7701778 - Nonvolatile semiconductor memory device (2010-04-20),
13. 7573742 - Nonvolatile semiconductor memory (2009-08-11),
14. 7515479 - Nonvolatile semiconductor storage device and method for writing therein (2009-04-07),
15. 7420206 - Interposer, semiconductor chip mounted sub-board, and semiconductor package (2008-09-02),

Title: Natsuo Ajika: Innovator in Semiconductor Memory Devices

Introduction

Natsuo Ajika, based in Hyogo, Japan, is a prominent inventor known for his substantial contributions to the field of semiconductor memory devices. With an impressive portfolio of 70 patents, Ajika has made significant strides in innovation, particularly in nonvolatile memory technologies.

Latest Patents

One of Ajika's latest patents is focused on a read disturb control mechanism in a nonvolatile semiconductor memory device equipped with a P-type memory cell transistor. This invention involves a control circuit designed to perform a program operation where the P-type memory cell transistor's threshold is maintained within specific values, aiding in effective electron injection into the charge storage layer. Another notable patent details a nonvolatile semiconductor memory device that features multiple layers of memory gate lines and a matrix of memory cells, utilizing a P-type MIS nonvolatile transistor architecture, showcasing Ajika's expertise in maximizing memory efficiency and reliability.

Career Highlights

Throughout his career, Natsuo Ajika has played pivotal roles at various renowned companies, notably Mitsubishi Electric Corporation and Genusion, Inc. His work at these organizations has been instrumental in advancing semiconductor technologies, earning him recognition among his peers and the broader tech community.

Collaborations

Ajika has collaborated with several notable colleagues, including Hideaki Arima and Atsushi Hachisuka. These partnerships have fostered an environment of innovation and creativity, significantly enhancing the development of new technologies within the semiconductor industry.

Conclusion

Natsuo Ajika stands as a key figure in the realm of semiconductor innovations, with numerous patents reflecting his dedication to advancing technology. His contributions not only highlight his inventive prowess but also pave the way for future developments in nonvolatile memory devices. As technology continues to evolve, Ajika's work will undoubtedly play a crucial role in shaping the future of semiconductor memory solutions.

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]
Loading…