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Hong Kong, China

Sae Magnetics (h.k.) Limited

Calculating rank

USPTO Granted Patents = 764

% Expired Patents = 40.3

Forward Citations = 4,984

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587 inventors (with patents filed for the assignee):

Yoshitaka Sasaki (181 out of 482 patents)

Hiroyuki Ito (112 out of 213 patents)

Masashi Shiraishi (98 out of 150 patents)

4. Atsushi Iijima (78 out of 108 patents)

5. Takehiro Kamigama (70 out of 84 patents)

6. Shigeki Tanemura (68 out of 175 patents)

7. Ellis T Cha (61 out of 71 patents)

8. Ryuji Fujii (59 out of 68 patents)

9. Kazuki Sato (56 out of 130 patents)

10. Naoto Matono (52 out of 54 patents)

11. MingGao Yao (51 out of 51 patents)

12. Hironori Araki (45 out of 138 patents)

13. Tatsuya Shimizu (35 out of 35 patents)

14. Ming Gao Yao (32 out of 34 patents)

15. Tatsushi Shimizu (31 out of 31 patents)

Core Competencies:

Thermally Assisted Magnetic Head

Hard Disk Drive

Thin-Film Piezoelectric Material

Head Gimbal Assembly

Microwave-Assisted Magnetic Recording

MEMS Microphone

Laser Diode

Air-Bearing Surface

Magnetic Field Generation

Optical Components

Sensor Technology

Semiconductor Laser

764 patents: Sort by Forward Citations

1. 12518783 - Thin-film piezoelectric material element (2026-01-06),

2. 12406690 - Light source unit, thermally assisted magnetic head, head gimbal assembly, and hard disk drive (2025-09-02),

3. 12400679 - Thermally assisted magnetic head, head gimbal assembly, and hard disk drive (2025-08-26),

4. 12387750 - DFH heater design (2025-08-12),

5. 12106786 - Magnetic head, head gimbal assembly, hard disk drive, and method for processing magnetic head (2024-10-01),

6. 12106783 - Microwave-assisted magnetic recording (MAMR) head slider with diamoind-like carbon layer and a silicon nitride layer, and related head gimbal assembly and disk drive unit (2024-10-01),

7. 12027179 - Thermally assisted magnetic head, light source unit bar like member, and hard disk drive (2024-07-02),

8. 11976948 - Angle detection apparatus, angle detection system, park lock system, pedal system, and magnetic field generation module (2024-05-07),

9. 11973310 - Light source unit and thermally-assisted magnetic head (2024-04-30),

10. 11887638 - Laser diode, thermally assisted magnetic head, head gimbal assembly, hard disk drive and method of manufacturing a head gimbal assembly (2024-01-30),

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

12. 11781049 - Adhesive glue, curing method therefor, and application thereof (2023-10-10),

13. 11763842 - Method of manufacturing head gimbal assembly, head gimbal assembly and hard disk drive (2023-09-19),

14. 11749302 - Method of manufacturing head gimbal assembly, head gimbal assembly and hard disk drive (2023-09-05),

15. 11735212 - Thermally assisted magnetic head including a record/read separate protective structure, head gimbal assembly and hard disk drive each having the thermally assisted magnetic head (2023-08-22),

Company Overview

Sae Magnetics (H.K.) Limited is a prominent player in the field of thermally assisted magnetic recording technology. The company specializes in the development and manufacturing of advanced components such as thermally assisted magnetic heads, hard disk drives, and head gimbal assemblies. With a focus on innovation, Sae Magnetics also explores cutting-edge technologies including thin-film piezoelectric materials, microwave-assisted magnetic recording, MEMS microphones, and laser diodes. Based in Hong Kong, the company is positioned at the forefront of magnetic recording solutions.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 27 2026

764 Patents

#4 in Hong Kong

#46 in China

#1,306 in the World

Hong Kong, China

Sae Magnetics (h.k.) Limited

Forward Citations = 4,984

587 inventors:

Yoshitaka Sasaki (181 out of 482 patents)

Hiroyuki Ito (112 out of 213 patents)

Masashi Shiraishi (98 out of 150 patents)

4. Atsushi Iijima (78 out of 108 patents)

5. Takehiro Kamigama (70 out of 84 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Sae Magnetics (h.k.) Limited. Retrieved from https://idiyas.com/company/sae-magnetics-h-k

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

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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