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For the Inventor, By the Inventor

Saitama, Japan

Fumihiko Yokogawa

This inventor holds 52 USPTO granted patents and 1 EPO patent, primarily in Optical Recording Technology (CPC class 369 ). Top assignees: Pioneer Electronic Corporation, Hitachi, Ltd., Kabushiki Kaisha Toshiba. Active years: 1979-2008.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Fumihiko Yokogawa. Retrieved from https://idiyas.com/inventor/fumihiko-yokogawa

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

USPTO Granted Patents = 52

% Patents Active = 96.2


Average Co-Inventor Count = 1.6

ph-index = 14

Forward Citations = 585(Granted Patents)

Forward Citations (Not Self Cited) = 580(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Tokorozawa, JP (1979 - 1991)
  • Saitama-ken, JP (1996 - 1997)
  • Saitama, JP (1985 - 1999)
  • Kawagoe, JP (1999)
  • Tsurugashima, JP (1994 - 2008)

Company Filing History:

goldMedal49 out of 2,861 
 
Pioneer Electronic Corporation
 patents
silverMedal4 out of 42,740 
 
Hitachi, Ltd.
 patents
bronzeMedal2 out of 53,276 
 
Kabushiki Kaisha Toshiba
 patents
4. 2 out of 27,375 
 
Matsushita Electric Industrial Co., Ltd.
 patents
5. 2 out of 2,679 
 
Pioneer Corporation
 patents
6. 1 out of 66 
 
Pioneer Electric Corporation
 patents
where one patent can have more than one assignee

Years Active: 1979-2008

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Areas of Expertise:
Optical Disk
Data Transmission
Tracking Error Signal
Digital Modulation
Recording Medium
Spindle Servo
Multi-Layered Disk
Clock Signal Generation
Error Correction
Disc Player
Phase-Locked Loop
Digital Signal Reproduction
52 patents (USPTO):Explore Patents
1. RE40312 - Digital data transmitting method (2008-05-12),
2. 7190664 - High density optical recording medium and method for reproducing thereof (2007-03-13),
3. 6968121 - Video disc having an aspect ratio information and video disc player having an aspect ratio converting function (2005-11-22),
4. 6463210 - Video disc having an aspect ratio information and video disc player having an aspect ratio converting function (2002-10-08),
5. 5987066 - Digital data transmitting method (1999-11-16),
6. 5917857 - Digital modulation apparatus, a digital modulation method, and a (1999-06-29),
7. 5914920 - Constant angular velocity type optical disk, double density recording (1999-06-22),
8. 5740152 - Spindle servo circuit in an apparatus for playing an optical disk having (1998-04-14),
9. 5646932 - Optical disk, tracking error signal generating apparatus, and tracking (1997-07-08),
10. 5629924 - Optical disk having synchronous marks and data marks to satisfy certain (1997-05-13),
11. 5617406 - Optical disc with heat blocking bands between tracks (1997-04-01),
12. 5608715 - Multi-layered recording disk and recording/reproducing system using the (1997-03-04),
13. 5600626 - Optical disk of sampled servo type having synchronization a marks for (1997-02-04),
14. 5583846 - Optical disc and system for generating a tracking error signal for the (1996-12-10),
15. 5471448 - Tracking servo apparatus for use in an optical disk player (1995-11-28),

Title: Fumihiko Yokogawa: Shaping the Future of Technology

Introduction

Fumihiko Yokogawa, a visionary inventor hailing from Saitama, Japan, is renowned for his passion for innovation and his relentless drive to make a positive impact on society. With 52 patents to his name, Yokogawa's legacy as a trailblazing inventor is firmly cemented in the world of technology.

Latest Patents

Among Fumihiko Yokogawa's impressive array of patents is a groundbreaking digital data transmitting method. This method allows for the reproduction of information data at a high precision level, crucial for maintaining the integrity of digital data across sectors. Through the use of innovative sync frames and sophisticated sync signals, Yokogawa's method ensures seamless transmission and robust data retention.

Another notable patent in Yokogawa's portfolio is the high-density optical recording medium and method for reproducing thereof. This invention, incorporated in optical discs, facilitates the reproduction of information stored as pit trains with a predetermined track pitch. By satisfying specific criteria related to track pitch, pit length, and wavelength, Yokogawa's optical disc design maximizes data storage capacity and enables efficient data retrieval.

Career Highlights

Throughout his illustrious career, Fumihiko Yokogawa has made significant contributions to leading technology companies such as Pioneer Electronic Corporation and Hitachi, Ltd. His innovative spirit and technical expertise have played a pivotal role in driving advancements in digital data transmission, optical storage technologies, and information retrieval systems.

Collaborations

Yokogawa's collaborative work with esteemed colleagues such as Hiroyuki Hirano and Hideki Hayashi has been instrumental in shaping the landscape of modern technology. Together, they have synergized their talents to develop cutting-edge solutions that push the boundaries of innovation and enhance the efficiency of data processing and storage systems.

Conclusion

In conclusion, Fumihiko Yokogawa's remarkable journey as an inventor underscores his unwavering commitment to innovation and his profound impact on technological advancements. His pioneering work in digital data transmission and optical storage technologies continues to inspire future generations of inventors, setting a high standard for excellence in the field of 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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