Kei Hirata

This inventor holds 94 USPTO granted patents and 2 published patent applications, plus 11 CIPO patents and 15 EPO patents, primarily in Magnetic Recording Technology (CPC class G11B5-1278). Top assignees: Tdk Corporation, Kuraray Co., Ltd., Amyris, Inc.. Active years: 2007-2024.

USPTO Granted Patents = 94 (Patent Applications = 2)

% Patents Active = 84.0

CIPO Patents = 11 (Patent Applications = 1)

EPO Patents = 15 (Patent Applications = 8)

Average Co-Inventor Count = 3.4

ph-index = 10

Forward Citations = 328(Granted Patents)

Forward Citations (Not Self Cited) = 314(Dec 10, 2025)

Inventors with similar research interests:

Location History:

Ibaraki, JP (2009 - 2011)
Chuo-ku, JP (2011)
Toyko, JP (2012)
Kamisu, JP (2014 - 2020)
Milpitas, CA (US) (2019 - 2020)
Sunnyvale, CA (US) (2019 - 2023)
Tokyo, JP (2007 - 2024)

Company Filing History:

Headway Technologies, Incorporated

patents

5. 4 out of 764

Sae Magnetics (h.k.) Limited

patents

where one patent can have more than one assignee

Years Active: 2007-2024

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Areas of Expertise:

Magnetic Recording

PMR Writer

Magnetic Head

Thermally Assisted Recording

Rubber Composition

Tire

High Damping Shield

Coil

Plasmon Generator

Thin Film Magnetic Head

Recording Method

Magnetic Disk Device

94 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 12024619 - Rubber compositions (2024-07-02),

2. 11699460 - Perpendicular magnetic recording (PMR) writer with recessed leading shield (2023-07-11),

3. 11295767 - Perpendicular magnetic recording (PMR) writer with recessed leading shield (2022-04-05),

4. 10839829 - Magnetic head with a main pole including first and second layers and manufacturing method for the same (2020-11-17),

5. 10781298 - Copolymer, rubber composition using same, and tire (2020-09-22),

6. 10586558 - Magnetic head including a main pole and a write shield (2020-03-10),

7. 10550248 - Rubber composition and tire (2020-02-04),

8. 10522178 - High damping shield with low magnetic moment in perpendicular magnetic recording (PMR) writer (2019-12-31),

9. 10490210 - Optimization of high damping shield geometry in perpendicular magnetic recording (PMR) writer (2019-11-26),

10. 10414834 - Modified liquid diene rubber and resin composition containing modified liquid diene rubber (2019-09-17),

11. 10370525 - Rubber compositions (2019-08-06),

12. 10339964 - Perpendicular magnetic recording (PMR) write head with patterned high moment trailing shield (2019-07-02),

13. 10297277 - Magnetic head including a coil and a magnetic path forming section (2019-05-21),

14. 10227481 - Rubber composition, vulcanized rubber, and tire (2019-03-12),

15. 9850336 - Copolymer, rubber composition using same, and tire (2017-12-26),

Title: Kei Hirata: Pioneering Innovations in Rubber Compositions and Magnetic Recording Technologies

Introduction

Kei Hirata, based in Tokyo, Japan, stands out as a prolific inventor with an impressive portfolio of 94 patents. His innovative contributions encompass advancements in rubber compositions and perpendicular magnetic recording (PMR) technologies. Hirata's dedication to enhancing material properties and recording efficiencies has established him as a significant figure in the field of engineering.

Latest Patents

Among his latest patents, one noteworthy invention is a rubber composition that provides a peroxide crosslinkable rubber including hydrogenated nitrile rubber. This invention notably enhances scorch stability while maintaining superior characteristics in the crosslinked products of the composition. The formula details 100 parts by mass of the hydrogenated nitrile rubber, along with specified proportions of fillers, organic peroxides, and liquid diene rubber.

Another innovative patent by Hirata is the design of a PMR writer featuring a recessed leading shield. This advanced write head includes a main write pole surrounded by strategic magnetic shields. The leading-edge taper of the leading shield is engineered to improve performance by varying the positioning of components relative to the air bearing surface, demonstrating a keen understanding of magnetic recording dynamics.

Career Highlights

Hirata has made significant contributions to the companies he has worked with, including TDK Corporation and Kuraray Co., Ltd. His ingenuity and research skills have played a critical role in pushing the boundaries of technology, particularly in fields requiring advanced material science and magnetic recording techniques.

Collaborations

Throughout his career, Kei Hirata has collaborated with esteemed professionals such as Koji Shimazawa and Yoshihiro Tsuchiya. Together, they have worked on projects that leverage their combined expertise to drive innovation and develop cutting-edge technologies.

Conclusion

Kei Hirata's body of work exemplifies the intersection of creativity and practical application in engineering. His contributions not only advance technological capabilities but also inspire future generations of inventors and innovators. With a continuous drive for improvement and excellence, Hirata remains an influential figure in both the rubber industry and magnetic recording technology.