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For the Inventor, By the Inventor

Tokai, Japan

Ken Takahashi

This inventor holds 53 USPTO granted patents, primarily in Optical Information Recording (CPC class G11B). Top assignees: Hitachi, Ltd., Hitachi Global Storage Technologies Japan, Ltd., Renesas Technology Corp.. Active years: 1978-2011.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Ken Takahashi. Retrieved from https://idiyas.com/inventor/ken-takahashi-ncl0snir

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

Calculating rank
USPTO Granted Patents = 53

% Patents Active = 73.6

Average Co-Inventor Count = 6.3

ph-index = 12

Forward Citations = 476(Granted Patents)

Forward Citations (Not Self Cited) = 453(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Tokaimura, JA (1978)
  • Tohkai, JP (1993)
  • Tohkai-mura, JP (1997 - 1998)
  • Ibaraki-ken, JP (1999 - 2003)
  • Tokai, JP (1995 - 2005)
  • Naka-gun, JP (2005)
  • Ibaraki, JP (1979 - 2006)
  • Tokai-mura, JP (1997 - 2007)
  • Hitachi, JP (1982 - 2009)
  • Sagamihara, JP (2010 - 2011)

Company Filing History:

goldMedal45 out of 42,743 
 
Hitachi, Ltd.
 patents
silverMedal2 out of 227 
 
Hitachi Global Storage Technologies Japan, Ltd.
 patents
bronzeMedal2 out of 3,781 
 
Renesas Technology Corp.
 patents
4. 1 out of 217 
 
Hitachi Device Engineering Co., Ltd.
 patents
5. 4 out of 834,601 
Other
 patents
where one patent can have more than one assignee

Years Active: 1978-2011

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Areas of Expertise:
Optical Information Recording
Magnetic Disk
Fuel Cell
Wiring Glass Substrate
Semiconductor Module
Information Recording Medium
Glass Composition
Superconducting Wire
Ferroelectric Element
Display Apparatus
Polymeric Metal Oxide
53 patents (USPTO):Explore Patents
1. 7901833 - Fuel cartridge for fuel cells, fuel cell, fuel cell power system and method of mounting a fuel cell cartridge on a fuel cell (2011-03-08),
2. 7833679 - Fuel cartridge and direct methanol fuel cell device (2010-11-16),
3. 7535106 - Wiring glass substrate for connecting a semiconductor chip to a printed wiring substrate and a semiconductor module having the wiring glass substrate (2009-05-19),
4. 7259936 - Glass substrate for a magnetic disk, a magnetic disk which can be formed with a stable texture and a magnetic disk device (2007-08-21),
5. 7232612 - Glass substrate of disk for recording information, a disk for recording information, and a disk device for recording information (2007-06-19),
6. 7183650 - Wiring glass substrate for connecting a semiconductor chip to a printed wiring substrate and a semiconductor module having the wiring glass substrate (2007-02-27),
7. 7169334 - Optical information recording medium (2007-01-30),
8. 7035049 - Glass substrate for a magnetic disk, a magnetic disk which can be formed with a stable texture and a magnetic disk device (2006-04-25),
9. 6992425 - Display apparatus with a multi-layer absorption, conduction and protection film (2006-01-31),
10. 6944117 - Information recording medium and information recording device (2005-09-13),
11. 6844092 - Optically functional element and production method and application therefor (2005-01-18),
12. 6801397 - Glass substrate for a magnetic disk, a magnetic disk which can be formed with a stable texture and a magnetic disk device (2004-10-05),
13. 6790502 - Optically functional element and production method and application therefor (2004-09-14),
14. 6749955 - Information recording media and information recording drive (2004-06-15),
15. 6746749 - Magnetic recording disk (2004-06-08),

Title: Ken Takahashi: Pioneering Inventor of Tokai-mura

Introduction:

Ken Takahashi is a pioneering inventor based in Tokai-mura, Japan, whose dedication to innovation and relentless pursuit of excellence have solidified his position as a prominent figure in the field.

Latest Patents:

With an impressive portfolio of 53 patents, Ken Takahashi's latest inventions include a fuel cartridge for fuel cells designed to determine the suitability of the fuel for the fuel cell and enable mechanical connection. Another notable patent is for a fuel cell device incorporating a fuel cell cartridge with a container for methanol mixed solution fuel, providing a unique approach to fuel cell technology.

Career Highlights:

Throughout his career, Ken Takahashi has demonstrated a profound understanding of fuel cell technology, leveraging his expertise to develop groundbreaking inventions. His innovative approach to addressing fuel cell efficiency and usability has earned him recognition in the industry.

Collaborations:

Ken Takahashi has collaborated with esteemed professionals in the field, including Hiroki Yamamoto and Takashi Naito. These collaborations have been instrumental in bringing his inventive concepts to fruition and pushing the boundaries of fuel cell technology.

Conclusion:

Ken Takahashi's innovative spirit and commitment to excellence have established him as a trailblazer in the field of fuel cell technology. His remarkable inventions continue to drive advancements in the industry, setting a high standard for innovation and ingenuity in Tokai-mura, Japan, and beyond.

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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