Katsuhiko Koui

This inventor holds 103 USPTO granted patents and 1 published patent application, primarily in Magnetic Memory Devices (CPC class G11B2005-0024). Top assignees: Kabushiki Kaisha Toshiba, Tdk Corporation. Active years: 2001-2021.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Katsuhiko Koui. Retrieved from https://idiyas.com/inventor/katsuhiko-koui

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

USPTO Granted Patents = 103 (Patent Applications = 1)

% Patents Active = 72.8

Average Co-Inventor Count = 4.2

ph-index = 20

Forward Citations = 1,360(Granted Patents)

Forward Citations (Not Self Cited) = 1,289(Dec 10, 2025)

Inventors with similar research interests:

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Location History:

Kawasaki, JP (2001 - 2010)
Kamagawa, JP (2011)
Ome, JP (2009 - 2012)
Kanagawa-ken, JP (2002 - 2013)
Tokyo, JP (2009 - 2013)
Yokohama, JP (2008 - 2019)
Kanagawa, JP (2015 - 2021)
Yokohama Kanagawa, JP (2015 - 2021)

Company Filing History:

103 out of 53,262

Kabushiki Kaisha Toshiba

where one patent can have more than one assignee

Years Active: 2001-2021

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Areas of Expertise:

Magnetic Memory

Nonvolatile Memory

Spin Torque Oscillator

Microwave-Assisted Recording

Magnetic Recording Head

Magnetoresistive Element

High Frequency Recording

Measurement Circuit

Stacked Body Configuration

Disk Drive

Magnetic Recording Apparatus

Reproducing Device

103 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 11017827 - Magnetic device storing first and second values (2021-05-25),

2. 10902900 - Magnetic memory device (2021-01-26),

3. 10896708 - Magnetic memory device (2021-01-19),

4. 10867649 - Magnetic memory device (2020-12-15),

5. 10811067 - Magnetic memory device with nonmagnetic layer between two magnetic layers (2020-10-20),

6. 10783947 - Magnetic memory device (2020-09-22),

7. 10529399 - Magnetic memory device (2020-01-07),

8. 10438616 - Magnetic recording head with specified thickness and saturation magnetic flux density products for STO magnetic layers (2019-10-08),

9. 10410707 - Nonvolatile memory (2019-09-10),

10. 10361358 - Spin orbit torque (SOT) MRAM having a source line connected to a spin orbit conductive layer and arranged above a magnetoresistive element (2019-07-23),

11. 10347313 - Magnetic memory (2019-07-09),

12. 10211394 - Magnetic memory (2019-02-19),

13. 10192572 - Magnetic recording head with specified thickness and saturation magnetic flux density products for STO magnetic layers (2019-01-29),

14. 10186284 - Magnetic head and magnetic recording and reproducing device (2019-01-22),

15. 10170694 - Magnetic memory (2019-01-01),

Title: Innovations of Katsuhiko Koui: A Pioneer in Magnetic Device Technology

Introduction: Katsuhiko Koui is a distinguished inventor based in Yokohama, Japan, known for his significant contributions to the field of magnetic devices. With an impressive portfolio of 103 patents, Koui's work has greatly advanced our understanding and capabilities in magnetic memory technology.

Latest Patents: Koui's latest innovations include a magnetic device that efficiently stores first and second values. This invention features a first conductive layer and a first magnetoresistive effect element, which utilizes a control terminal and a specialized circuit for current supply and voltage application. This technology enhances data storage by enabling logical operations between stored data values and control voltages. Additionally, he developed a magnetic memory device comprised of layered magnetic elements, controlled by a current flow through a conductive member. This design allows for the identification of three or more levels of electrical resistance value within the stacked layers, marking a significant advancement in magnetic memory device technology.

Career Highlights: Throughout his career, Katsuhiko Koui has worked with notable companies in the tech sector, including Kabushiki Kaisha Toshiba and TDK Corporation. His expertise in magnetic devices and memory technology has positioned him as a leading figure in the industry, particularly known for innovative solutions that merge functionality with efficiency.

Collaborations: Koui has collaborated with esteemed colleagues, including Hitoshi Iwasaki and Kenichiro Yamada. Their combined efforts in research and development have yielded advancements that continue to influence the landscape of magnetic storage technologies.

Conclusion: Katsuhiko Koui's contributions to the field of magnetic devices, showcased through his extensive patent portfolio, demonstrate his innovative spirit and commitment to advancing technology. His work not only enhances our current understanding but also paves the way for the future of magnetic memory systems.

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]

1 patent pending: