Akemi Hirotsune

This inventor holds 70 USPTO granted patents and 5 published patent applications and 4 EPO patents, primarily in Information Storage Media (CPC class G11B). Top assignees: Hitachi, Ltd., Hitachi Maxell, Limited, Hgst Netherlands, B.v.. Active years: 1997-2019.

USPTO Granted Patents = 70 (Patent Applications = 5)

% Patents Active = 58.6

EPO Patents = 4 (Patent Applications = 2)

Average Co-Inventor Count = 4.5

ph-index = 12

Forward Citations = 431(Granted Patents)

Forward Citations (Not Self Cited) = 414(Dec 10, 2025)

Inventors with similar research interests:

Location History:

Higashimurayama, JP (1997 - 2011)
Urawa, JP (2003 - 2011)
Saitama, JP (2003 - 2012)
Odawara, JP (2011 - 2016)
Kanagawa, JP (2013 - 2019)

Company Filing History:

Hitachi Maxell, Limited

patents

4 out of 987

Hgst Netherlands, B.v.

patents

4. 1 out of 365

Hitachi Consumer Electronics Co., Ltd.

patents

5. 1 out of 56

Hitachi Maxwell, Ltd.

Western Digital Technologies, Inc.

patents

8. 15 out of 834,350

Other

patents

where one patent can have more than one assignee

Years Active: 1997-2019

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Areas of Expertise:

Perpendicular Magnetic Recording

Optical Recording Medium

Multilayer Optical Disc

Information Storage Device

Recording Method

Signal Reproducing Apparatus

Memory Medium

Crosstalk Reduction

Noise Suppression

Recording System

Information Retrieval

Mark Edge Jitters

70 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 10276192 - Perpendicular magnetic recording medium (2019-04-30),

2. 9472228 - Perpendicular magnetic recording media having novel magnetic under-layer structure (2016-10-18),

3. 9117477 - Perpendicular magnetic recording media having novel seed layer (2015-08-25),

4. 8703307 - Perpendicular magnetic recording medium and magnetic storage apparatus using the same (2014-04-22),

5. 8592060 - Perpendicular magnetic recording media having low medium noise and systems using the same (2013-11-26),

6. 8514684 - Multilayer optical disc for easy positioning of a focused beam (2013-08-20),

7. 8315147 - Multilayer optical recording medium having three or more recording layers with reduced interlayer crosstalk (2012-11-20),

8. 8134905 - Information storage device and storage media (2012-03-13),

9. 8089841 - Reproducing signal measuring method, signal reproducing apparatus, and optical recording medium (2012-01-03),

10. 8040712 - Information memory device and memory medium (2011-10-18),

11. 7948861 - Optical disk and recording method of visible figures into optical disk (2011-05-24),

12. 7911930 - Information recording media, a method for recording/reproducing information, an apparatus for recording/reproducing information (2011-03-22),

13. 7911910 - Information recording method and apparatus with suppressed mark edge jitters (2011-03-22),

14. 7907491 - Information recording method and apparatus with suppressed mark edge jitters (2011-03-15),

15. 7907490 - Information recording method and apparatus with suppressed mark edge jitters (2011-03-15),

Certainly! Here is the article:

Title: The Visionary Inventor: Akemi Hirotsune

Introduction: Akemi Hirotsune, a renowned inventor based in Saitama, Japan, is a trailblazer in the field of technology with an impressive portfolio of 70 patents. His groundbreaking work has left an indelible mark on the world of innovation.

Latest Patents:

1. Perpendicular magnetic recording medium: Akemi Hirotsune's patented magnetic recording medium features an innovative design consisting of an amorphous buffer layer, a hybrid layer with a barrier layer and texture control layer, a heat sink layer, an under layer, and a perpendicular recording layer.

2. Perpendicular magnetic recording media with novel magnetic under-layer structure: Another notable invention by Hirotsune includes a magnetic medium for perpendicular magnetic data recording, boasting improved corrosion characteristics and reduced surface roughness. The medium comprises an under-layer and a perpendicular magnetic recording layer, with the under-layer typically composed of MgO.

Career Highlights: Akemi Hirotsune has made significant contributions to the industry while working at esteemed companies like Hitachi, Ltd., where his inventive spirit has led to numerous technological advancements. His dedication to pushing the boundaries of innovation has set him apart as a leader in his field.

Collaborations: Throughout his career, Hirotsune has collaborated with talented individuals such as Motoyasu Terao and Yumiko Anzai. Together, they have worked on cutting-edge projects that have shaped the landscape of modern technology.

Conclusion: In conclusion, Akemi Hirotsune stands as a visionary inventor whose work continues to shape the future of technology, inspiring generations to come. His remarkable patents and collaborative efforts stand as a testament to his ingenuity and dedication to driving innovation forward.

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