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For the Inventor, By the Inventor

Tokyo, Japan

Tetsuya Roppongi

This inventor holds 76 USPTO granted patents, primarily in Magnetic Recording Technology (CPC class G11B). Top assignees: Tdk Corporation, Headway Technologies, Incorporated, Sae Magnetics (h.k.) Limited. Active years: 2000-2023.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Tetsuya Roppongi. Retrieved from https://idiyas.com/inventor/tetsuya-roppongi

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

Calculating rank
USPTO Granted Patents = 76

% Patents Active = 82.9

Average Co-Inventor Count = 4.1

ph-index = 15

Forward Citations = 843(Granted Patents)

Forward Citations (Not Self Cited) = 782(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Kawasaki, JP (2000 - 2004)
  • Chuo-ku, JP (2005 - 2009)
  • Tokyo, JP (2004 - 2020)
  • Milpitas, CA (US) (2020 - 2022)
  • San Jose, CA (US) (2019 - 2023)

Company Filing History:

goldMedal62 out of 8,282 
 
Tdk Corporation
 patents
silverMedal11 out of 1,232 
 
Headway Technologies, Incorporated
 patents
bronzeMedal4 out of 764 
 
Sae Magnetics (h.k.) Limited
 patents
4. 1 out of 6 
 
Tdk Corpoartion
 patents
5. 2 out of 834,659 
Other
 patents
where one patent can have more than one assignee

Years Active: 2000-2023

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Areas of Expertise:
Spin Torque Oscillator
Magnetic Head
Thermally-Assisted Recording
Magnetoresistance Effect
Microwave Assisted Head
Magnetic Recording Device
Magnetic Flux Guiding
Heat-Assisted Writing
Plasmon Generator
Head Gimbal Assembly
Magnetic Sensor
Negative Spin Polarization
76 patents (USPTO):Explore Patents
1. 11568891 - Magnetic flux guiding device with spin torque oscillator (STO) film having negative spin polarization layers in assisted writing application (2023-01-31),
2. 11514931 - Magnetic head including main pole having top surface including first inclined portion, second inclined portion, and third inclined portion, and spin torque oscillator (2022-11-29),
3. 11289117 - Magnetic head including spin torque oscillator (2022-03-29),
4. 11211082 - Magnetic head including spin torque oscillator (2021-12-28),
5. 10937450 - Magnetic flux guiding device with spin torque oscillator (STO) film having one or more negative spin polarization layers in assisted writing application (2021-03-02),
6. 10839829 - Magnetic head with a main pole including first and second layers and manufacturing method for the same (2020-11-17),
7. 10803888 - Magnetic head including spin torque oscillator and manufacturing method for the same (2020-10-13),
8. 10748559 - Magnetic head including spin torque oscillator and manufacturing method for the same (2020-08-18),
9. 10559412 - Magnetoresistance effect device (2020-02-11),
10. 10522174 - Magnetic flux guiding device with antiferromagnetically coupled (AFC) spin polarizer in assisted writing application (2019-12-31),
11. 10490216 - Magnetic flux guiding device with antiferromagnetically coupled (AFC) oscillator in assisted writing application (2019-11-26),
12. 10424326 - Magnetic flux guiding device with antiferromagnetically coupled (AFC) spin polarizer in assisted writing application (2019-09-24),
13. 10121497 - Magnetic recording head with spin torque oscillator layers satisfying width, thickness and angle relationship formulas (2018-11-06),
14. 10109302 - Magnetic recording head with spin torque oscillator, head gimbal assembly and magnetic recording apparatus (2018-10-23),
15. 10032470 - Magnetic recording head with spin torque oscillator, head gimbal assembly and magnetic recording apparatus (2018-07-24),

Title: Tetsuya Roppongi: Pioneering Inventor from Tokyo

Introduction: Tetsuya Roppongi is a renowned inventor hailing from the vibrant city of Tokyo, Japan. With a passion for innovation and a keen eye for detail, he has made significant contributions to various fields through his groundbreaking inventions.

Latest Patents: Tetsuya Roppongi holds several patents in the areas of robotics, artificial intelligence, and sustainable energy solutions. His most recent patents focus on enhancing efficiency in manufacturing processes and improving renewable energy technologies.

Career Highlights: Throughout his illustrious career, Tetsuya Roppongi has worked with leading tech companies and research institutions to bring his inventions to life. His innovative spirit and dedication to pushing the boundaries of technology have earned him recognition as a trailblazer in the industry.

Collaborations: Tetsuya Roppongi has collaborated with top engineers, scientists, and designers from around the world to develop cutting-edge solutions to complex challenges. His collaborative efforts have resulted in the creation of revolutionary products that have had a lasting impact on society.

Conclusion: Tetsuya Roppongi's relentless pursuit of innovation and his commitment to excellence continue to inspire the next generation of inventors. His remarkable contributions to the world of technology have solidified his legacy as a true visionary in the field of inventions.

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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