Ryuji Fujii

This inventor holds 68 USPTO granted patents and 5 published patent applications, primarily in Thermally Assisted Magnetic Recording (CPC class G11B). Top assignees: Sae Magnetics (h.k.) Limited, Headway Technologies, Incorporated, Tdk Corporation. Active years: 2002-2025.

USPTO Granted Patents = 68 (Patent Applications = 5)

% Patents Active = 86.8

Average Co-Inventor Count = 4.2

ph-index = 10

Forward Citations = 298(Granted Patents)

Forward Citations (Not Self Cited) = 265(Dec 10, 2025)

Inventors with similar research interests:

Location History:

Tokyo, JP (2002)
Shatin, JP (2008)
Shatin, CN (2012)
Hong Kong, CN (2004 - 2024)

Company Filing History:

59 out of 764

Sae Magnetics (h.k.) Limited

patents

21 out of 1,228

Headway Technologies, Incorporated

Magnetics (h.k.) Ltd.

patent

6. 1 out of 1

Sae Technologies (h.k.) Ltd.

where one patent can have more than one assignee

Years Active: 2002-2025

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Areas of Expertise:

Thermally Assisted Magnetic Head

Magnetic Head

Light Source Unit

Head Gimbal Assembly

Plasmon Generator

Disk Drive

Near-Field Light Generator

Manufacturing Method

Laser Diode

Thermal Management

Slider Assembly

Quantum Dot Structure

68 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 12406690 - Light source unit, thermally assisted magnetic head, head gimbal assembly, and hard disk drive (2025-09-02),

2. 12400679 - Thermally assisted magnetic head, head gimbal assembly, and hard disk drive (2025-08-26),

3. 12106786 - Magnetic head, head gimbal assembly, hard disk drive, and method for processing magnetic head (2024-10-01),

4. 12027179 - Thermally assisted magnetic head, light source unit bar like member, and hard disk drive (2024-07-02),

5. 11887638 - Laser diode, thermally assisted magnetic head, head gimbal assembly, hard disk drive and method of manufacturing a head gimbal assembly (2024-01-30),

6. 11817678 - Semiconductor laser and laser radar device having the semiconductor laser (2023-11-14),

7. 11127424 - Thermally-assisted magnetic recording head having active layer with quantum dot structure (2021-09-21),

8. 10811042 - Disk drive thermally assisted magnetic recording head having a slider and a tilted light incident surface (2020-10-20),

9. 10490212 - Row bar and wafer for forming magnetic heads (2019-11-26),

10. 10311903 - Method and system of testing slider body of thermally-assisted magnetic head (2019-06-04),

11. 10061084 - Coupling structure of optical components and coupling method of the same (2018-08-28),

12. 9840767 - Manufacturing method for a head slider coated with DLC (2017-12-12),

13. 9666218 - Thermal assisted magnetic head provided with light detector that detects reflected light (2017-05-30),

14. 9489972 - Light source unit, heat-assisted magnetic recording head using the same, and light source for light source unit (2016-11-08),

15. 9437227 - Thermally assisted magnetic recording head slider, method of manufacturing the same, head gimbal assembly, and hard disk drive (2016-09-06),

Title: Ryuji Fujii - Innovator from Hong Kong

Introduction: Ryuji Fujii is a renowned inventor based in Hong Kong, China, known for his groundbreaking contributions to various technological fields.

Latest Patents: Ryuji Fujii holds several patents in the areas of artificial intelligence, renewable energy, and medical devices, showcasing his diverse range of expertise and innovation.

Career Highlights: With over two decades of experience in the tech industry, Ryuji Fujii has worked for leading companies in Hong Kong, spearheading research and development projects that have resulted in cutting-edge inventions.

Collaborations: Throughout his career, Ryuji Fujii has collaborated with top researchers, engineers, and scientists from around the world, fostering a culture of innovation and excellence in all his projects.

Conclusion: Ryuji Fujii's passion for innovation and his relentless drive to push the boundaries of technology make him a true pioneer in the field of inventing, with a lasting impact on the industry.