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For the Inventor, By the Inventor

Higashiyamato, Japan

Tatsuharu Kusumoto

This inventor holds 13 USPTO granted patents. Top assignee: Kabushiki Kaisha Toshiba. Active years: 1998-2007.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Tatsuharu Kusumoto. Retrieved from https://idiyas.com/inventor/tatsuharu-kusumoto

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

Calculating rank
USPTO Granted Patents = 13

% Patents Active = 46.2

Average Co-Inventor Count = 1.4

ph-index = 6

Forward Citations = 147(Granted Patents)


Location History:

  • Higashiyamoto, JP (2003)
  • Tokyo, JP (1998 - 2004)
  • Higashiyamato, JP (2002 - 2007)

Company Filing History:

goldMedal13 out of 53,286 
 
Kabushiki Kaisha Toshiba
 patents

Years Active: 1998-2007

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13 patents (USPTO):Explore Patents
1. 7206158 - Disk drive for quickly retracting head to retract area, and emergency head-unload control circuit for use in the disk drive (2007-04-17),
2. 7019939 - Apparatus and method for positioning head at target position on disk (2006-03-28),
3. 6922302 - Calibration method for use in head loading/unloading type disk apparatus (2005-07-26),
4. 6894862 - Servo system with learning function for achieving servo compensation in a disk drive (2005-05-17),
5. 6765746 - Method and apparatus employed in disk drive for retracting head when power supply has been interrupted (2004-07-20),
6. 6765742 - Disk storage apparatus and head load control method (2004-07-20),
7. 6760183 - Servo system with runout compensation for disk drive (2004-07-06),
8. 6661598 - Calibration method for use in head loading/unloading type disk apparatus (2003-12-09),
9. 6650499 - Servo system with learning function for achieving servo compensation in a disk drive (2003-11-18),
10. 6594102 - Apparatus and method for retracting the head on power down in a disk drive (2003-07-15),
11. 6496319 - Calibration method for use in head loading/unloading type disk apparatus (2002-12-17),
12. 6175465 - Head positioning control system for use in a disk storage drive (2001-01-16),
13. 5801897 - Head positioning control system for use in a disk storage system (1998-09-01),

Title: Innovations by Inventor Tatsuharu Kusumoto

Introduction

Tatsuharu Kusumoto is a notable inventor based in Higashiyamato, Japan, with a remarkable portfolio of 13 patents. His contributions to technology, particularly in the realm of disk drive systems, have added significant advancements to the field of data storage and retrieval.

Latest Patents

Among his most recent patents are two significant innovations:

1. **Disk Drive for Quickly Retracting Head to Retract Area and Emergency Head-Unload Control Circuit**: This invention features a reset circuit that asserts a reset signal when either a power-off detection signal or a drop detection signal is activated. When the reset signal is triggered, the emergency unload circuit delivers current to the voice coil motor, facilitating the retraction of the head to a designated area. Notably, this circuit employs an auxiliary power supply as its operational power source.

2. **Apparatus and Method for Positioning Head at Target Position on Disk**: This invention involves a complex CPU-driven process that calculates a first offset value reflecting a track pitch to mitigate crosstalk effects. The CPU determines a second target track and corresponding offset value based on the first target track's position and the calculated first offset. Through this advanced method, the head is positioned accurately on the designated second target track.

Career Highlights

Throughout his career, Tatsuharu Kusumoto has demonstrated an unwavering commitment to innovation while working at Kabushiki Kaisha Toshiba, a prominent company in the technology sector. His work has not only earned him numerous patents but also positioned him as a leading figure in the advancement of disk drive technologies.

Collaborations

In his journey as an inventor, Tatsuharu has collaborated with esteemed colleagues, including Hidetoshi Kawachi and Hiroyuki Kanda. Working alongside such talented individuals has fostered an environment of creativity and knowledge exchange, enhancing the quality and impact of their innovations.

Conclusion

Tatsuharu Kusumoto's contributions to the field of technology are evident through his patents and collaborative efforts. His inventions, particularly in the realm of disk drives, pave the way for future advancements in data storage solutions, reaffirming his status as a prominent inventor in the industry.

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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