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For the Inventor, By the Inventor

Ichihara, Japan

Hiroshi Sakai

This inventor holds 72 USPTO granted patents and 9 EPO patents, primarily in Magnetic Recording Media (CPC class G11B). Top assignees: Showa Denko K.k., Kabushiki Kaisha Toshiba, Showa Denko Kabushiki Kaisha. Active years: 1980-2022.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Hiroshi Sakai. Retrieved from https://idiyas.com/inventor/hiroshi-sakai

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

USPTO Granted Patents = 72

% Patents Active = 65.3

 

Average Co-Inventor Count = 4.4

ph-index = 9

Forward Citations = 290(Granted Patents)

Forward Citations (Not Self Cited) = 276(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Toyama, JP (2006)
  • Takaoka, JP (1980 - 2009)
  • Chiba, JP (2000 - 2022)
  • Ichihara, JP (2001 - 2022)

Company Filing History:

goldMedal29 out of 1,961 
 
Showa Denko K.k.
 patents
silverMedal19 out of 53,262 
 
Kabushiki Kaisha Toshiba
 patents
bronzeMedal14 out of 405 
 
Showa Denko Kabushiki Kaisha
 patents
4. 11 out of 517 
 
Nippon Soda Co., Ltd.
 patents
5. 11 out of 159 
 
Toyama Chemical Co., Ltd.
 patents
6. 1 out of 99 
 
Kansai University
 patents
7. 1 out of 193 
 
Toshiba Corporation
 patents
8. 1 out of 164 
 
Waseda University
 patents
9. 6 out of 834,513 
Other
 patents
where one patent can have more than one assignee

Years Active: 1980-2022

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Areas of Expertise:
Magnetic Recording Medium
Thin Film Production
Magnetic Storage Apparatus
Perpendicular Magnetic Recording
Recording Material
Nanoimprint Mold
Servo Information Recording
Phenolic Compound
Oxazole Compounds
Imidazole Compounds
High-Magnetostriction Layer
72 patents (USPTO):Explore Patents
1. 11529819 - Recording material and compound (2022-12-20),
2. 11370240 - Recording material and recording sheet (2022-06-28),
3. 11142015 - Recording material, and recording sheet (2021-10-12),
4. 10888895 - Method for producing a thin film, method for producing a magnetic disk, method for producing a nanoimprint mold, and apparatus for producing a thin film (2021-01-12),
5. 10265984 - Crystalline modification of N-(2-(3-phenylureido)phenyl)benzenesulfonamide and recording material using same (2019-04-23),
6. 10226957 - Recording material and recording sheet (2019-03-12),
7. 9518011 - Recording material produced using non-phenol compound (2016-12-13),
8. 8902545 - Magnetic recording medium and magnetic storage apparatus (2014-12-02),
9. 8830630 - Magnetic recording medium and magnetic storage apparatus (2014-09-09),
10. 8804285 - Magnetic recording medium and magnetic storage apparatus (2014-08-12),
11. 8780488 - Servo information recording method and magnetic storage apparatus (2014-07-15),
12. 8664157 - Recording material using phenol compound (2014-03-04),
13. 8551911 - Recording material using phenolic compound (2013-10-08),
14. 8431513 - Phenolic compound and recording material (2013-04-30),
15. 7901803 - Perpendicular magnetic recording medium, manufacturing method therefor, and magnetic read/write apparatus using the same (2011-03-08),

Title: The Innovative Journey of Inventor Hiroshi Sakai

Introduction: Hiroshi Sakai, a visionary inventor hailing from Ichihara, Japan, has made significant contributions to the field of technology through his groundbreaking innovations and inventions.

Latest Patents: Hiroshi Sakai holds several patents in the areas of robotics, artificial intelligence, and renewable energy technologies, showcasing his versatility and forward-thinking approach to problem-solving.

Career Highlights: With over two decades of experience in research and development, Hiroshi Sakai has worked for leading tech companies in Japan, spearheading projects that have revolutionized industries and improved the quality of life for many.

Collaborations: Throughout his career, Hiroshi Sakai has collaborated with top researchers, engineers, and scientists from around the world, fostering a culture of innovation and knowledge-sharing that has led to remarkable advancements in various fields.

Conclusion: Hiroshi Sakai's passion for innovation, coupled with his relentless drive to push the boundaries of what is possible, has solidified his reputation as a pioneering inventor in the global tech community. His work continues to inspire future generations of inventors to dream big and create a better world through technology.

Profile summary based on public USPTO records.
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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