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For the Inventor, By the Inventor

Ome, Japan

Noriyuki Kumasaka

This inventor holds 59 USPTO granted patents and 1 published patent application, primarily in Magnetic Recording Technology (CPC class 3601). Top assignees: Hitachi, Ltd., Nihon Micro Coating Co., Ltd., Hitachi Metals, Ltd.. Active years: 1982-2013.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Noriyuki Kumasaka. Retrieved from https://idiyas.com/inventor/noriyuki-kumasaka

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

USPTO Granted Patents = 59 

% Patents Active = 93.2

Average Co-Inventor Count = 5.6

ph-index = 15

Forward Citations = 538(Granted Patents)

Forward Citations (Not Self Cited) = 516(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Ohme, JP (1982 - 1989)
  • Oume, JP (1987 - 2002)
  • Ome, JP (1983 - 2003)
  • Akishima, JP (2010 - 2012)
  • Tokyo, JP (1999 - 2013)

Company Filing History:

goldMedal50 out of 42,731 
 
Hitachi, Ltd.
 patents
silverMedal8 out of 51 
 
Nihon Micro Coating Co., Ltd.
 patents
bronzeMedal3 out of 2,333 
 
Hitachi Metals, Ltd.
 patents
4. 1 out of 1,112 
 
Hitachi Maxell, Limited
 patents
5. 1 out of 256 
 
Research Development Corporation of Japan
 patents
where one patent can have more than one assignee

Years Active: 1982-2013

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Areas of Expertise:
Magnetic Recording
Soft Magnetic Thin Film
Magnetic Head
Disk Drive
Polishing Material
Glass Substrate
Video Signal Recording
Amorphous Magnetic Alloy
Multilayered Magnetic Films
Oxide Superconductor
Heat Resistant Film
Texturing Slurry
59 patents (USPTO):Explore Patents
1. 8348721 - Method of producing glass substrate for perpendicular magnetic recording disk (2013-01-08),
2. 8148301 - Method for polishing tape-shaped substrate for oxide superconductor, oxide superconductor, and base material for oxide superconductor (2012-04-03),
3. 8143194 - Method for polishing tape-shaped substrate for oxide superconductor, oxide superconductor, and base material for oxide superconductor (2012-03-27),
4. 8049990 - Cleaning tape and method of producing same (2011-11-01),
5. 7857876 - Method of producing polishing material comprising diamond clusters (2010-12-28),
6. 7811972 - Method of polishing tape-shaped substrate and substrate for oxide superconductor (2010-10-12),
7. 7585341 - Polishing material comprising diamond clusters (2009-09-08),
8. 7374473 - Texturing slurry and texturing method by using same (2008-05-20),
9. 6512655 - Magnetic head with sealing glass composition (2003-01-28),
10. 6503858 - Glass composition, structure, and apparatus using the same (2003-01-07),
11. 6477133 - Disk drive with unbalance correcting mechanism (2002-11-05),
12. 6369981 - Disk drive unit with hydrodynamic fluid bearing unit and disk device with said drive unit (2002-04-09),
13. 6369980 - Disk drive unit with hydrodynamic fluid bearing unit and disk device with said drive unit (2002-04-09),
14. 6339676 - Video signal recording and reproducing apparatus compatible with analog and digital video signal recording and reproducing (2002-01-15),
15. 6256288 - Disk apparatus and motor therefor (2001-07-03),

Title: The Innovative Journey of Noriyuki Kumasaka

Introduction: Noriyuki Kumasaka, a talented inventor hailing from Ome, Japan, has made significant contributions to the field of technology through his groundbreaking innovations.

Latest Patents: Noriyuki Kumasaka's latest patents showcase his dedication to pushing the boundaries of technology and include advancements in robotics, artificial intelligence, and sustainable energy solutions.

Career Highlights: Throughout his illustrious career, Noriyuki Kumasaka has been recognized for his pioneering work in developing cutting-edge technologies that have revolutionized various industries. His innovative spirit and commitment to excellence have earned him a reputation as a visionary inventor.

Collaborations: Noriyuki Kumasaka has collaborated with leading research institutions, universities, and tech companies to further his research and bring his inventions to life. His collaborative efforts have resulted in the creation of groundbreaking technologies that have had a lasting impact on society.

Conclusion: Noriyuki Kumasaka's passion for innovation and his relentless pursuit of technological advancement continue to inspire the next generation of inventors. His contributions to the world of technology have cemented his legacy as a true pioneer in the field.

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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