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Hitachi Global Storage Technologies Japan, Ltd.

Calculating rank

USPTO Granted Patents = 227

% Expired Patents = 82.8

EPO Patents = 4

Forward Citations = 1,744

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343 inventors (with patents filed for the assignee):

Mikio Tokuyama (18 out of 76 patents)

Yasutaka Nishida (15 out of 82 patents)

Hisashi Takano (15 out of 113 patents)

4. Hideki Sawaguchi (13 out of 46 patents)

5. Takehiko Hamaguchi (13 out of 45 patents)

6. Yoshiaki Kawato (13 out of 39 patents)

7. Hiroyuki Hoshiya (10 out of 60 patents)

8. Kazuhiro Nakamoto (10 out of 31 patents)

9. Masafumi Mochizuki (10 out of 66 patents)

10. Ichiro Tamai (10 out of 36 patents)

11. Shigeo Nakamura (9 out of 108 patents)

12. Yoshiyuki Hirayama (9 out of 48 patents)

13. Nobuo Yoshida (9 out of 41 patents)

14. Toshihiko Shimizu (9 out of 69 patents)

15. Yuzuru Hosoe (9 out of 60 patents)

Core Competencies:

Magnetic Recording

Signal Processing

Magnetic Head

Data Reproducing

Thin Film

Perpendicular Recording

Storage Apparatus

Magnetoresistive Head

Magnetic Disk Drive

Data Encryption

Fabrication Method

Magnetic Media

227 patents: Sort by Forward Citations

1. 8345371 - Information storing device and method for controlling same to record/reproduce information by selecting one of working modes (2013-01-01),

2. 8144415 - Apparatus, signal-processing circuit and device for magnetic recording system (2012-03-27),

3. 8117518 - Signal processing apparatus and a data recording and reproducing apparatus including local memory processor (2012-02-14),

4. 8089717 - Data reproducing apparatus for improving data recording efficiency (2012-01-03),

5. 8085499 - Thin film perpendicular magnetic recording head, their fabrication process and magnetic disk drive using it (2011-12-27),

6. 7982999 - Information storing device and method for controlling same to record/reproduce information by selecting one of working modes (2011-07-19),

7. 7903374 - Magnetic recording and reading device (2011-03-08),

8. 7885039 - Magnetic head supporting mechanism with regulating member which prevents over angulation of the slider support (2011-02-08),

9. 7865799 - Recording format for information date, information recording/reproducing cording circuit (2011-01-04),

10. 7839590 - Method of servo writing for magnetic recording system, magnetic recording system (2010-11-23),

11. 7817367 - Apparatus, signal-processing circuit and device for magnetic recording system (2010-10-19),

12. 7813079 - Thin film perpendicular magnetic recording head, their fabrication process and magnetic disk drive using it (2010-10-12),

13. 7783895 - Method and apparatus for encrypting data to be secured and inputting/outputting the same (2010-08-24),

14. 7782566 - Magnetic recording and reading device (2010-08-24),

15. 7752461 - Storage apparatus that can properly recommence input and output of classified data (2010-07-06),

Company Overview

Hitachi Global Storage Technologies Japan, Ltd., based in Odawara, specializes in magnetic recording technology, focusing on the development and manufacturing of advanced storage solutions. The company is recognized for its expertise in magnetic recording, signal processing, and the design of innovative magnetic heads. Its research encompasses critical areas such as perpendicular recording and magnetoresistive heads, contributing to the evolution of data storage apparatuses. Hitachi's commitment to technological advancement positions it as a key player in the storage industry.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 27 2026

227 Patents

#1 in Odawara

#649 in Japan

#3,779 in the World

Hitachi Global Storage Technologies Japan, Ltd.

Forward Citations = 1,744

343 inventors:

Mikio Tokuyama (18 out of 76 patents)

Yasutaka Nishida (15 out of 82 patents)

Hisashi Takano (15 out of 113 patents)

4. Hideki Sawaguchi (13 out of 46 patents)

5. Takehiko Hamaguchi (13 out of 45 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Hitachi Global Storage Technologies Japan, Ltd.. Retrieved from https://idiyas.com/company/hitachi-global-storage-technologies-japan

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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