Yoshikatsu Fujii

This inventor holds 7 USPTO granted patents. Top assignees: Hitachi, Ltd., Hitachi Global Storage Technologies Japan, Ltd.. Active years: 1999-2008.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Yoshikatsu Fujii. Retrieved from https://idiyas.com/inventor/yoshikatsu-fujii

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

USPTO Granted Patents = 7

% Patents Active = 42.9

Average Co-Inventor Count = 6.0

ph-index = 5

Forward Citations = 77(Granted Patents)

Location History:

Tokyo, JP (2005)
Atsugi, JP (1999 - 2008)

Company Filing History:

Hitachi Global Storage Technologies Japan, Ltd.

patents

Years Active: 1999-2008

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7 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 7375917 - Idle seek calibration method for magnetic disk drive and magnetic disk drive with an intermission calibration (2008-05-20),

2. 6950264 - Disk drive system for controlling seek operations (2005-09-27),

3. 6920007 - Load/unload method and a magnetic disk drive using the method (2005-07-19),

4. 6510014 - Disturbance detection circuit, memory device thereof, and disturbance detection method (2003-01-21),

5. 6407876 - Magnetic disk apparatus having an accelerometer for detecting acceleration in the positioning direction of the magnetic head (2002-06-18),

6. 6335845 - Magnetic disk apparatus having an accelerometer for detecting acceleration in the positioning direction of the magnetic head (2002-01-01),

7. 5986845 - Apparatus for positioning magnetic head and method of the same (1999-11-16),

Title: The Innovations of Yoshikatsu Fujii

Introduction

Yoshikatsu Fujii is a notable inventor based in Atsugi, Japan. He has made significant contributions to the field of magnetic disk drives, holding a total of 7 patents. His work has greatly influenced the efficiency and performance of data storage technologies.

Latest Patents

Fujii's latest patents include an idle seek calibration method for magnetic disk drives and a magnetic disk drive with an intermission calibration. The idle seek calibration method addresses the deterioration of velocity control accuracy due to temperature variations in the VCM actuator during idle seek operations. By utilizing control information, such as track numbers read from the magnetic disk medium, the method calibrates the velocity control, enhancing stability and reducing power consumption. This is particularly beneficial for portable systems like notebook computers. The second patent focuses on controlling seek operations in a disk drive system, where the data transducer control is based on the distance to be traversed, optimizing the movement of the head.

Career Highlights

Fujii has worked with prominent companies in the technology sector, including Hitachi, Ltd. and Hitachi Global Storage Technologies Japan, Ltd. His experience in these organizations has allowed him to develop and refine his innovative ideas in magnetic disk technology.

Collaborations

Throughout his career, Fujii has collaborated with talented individuals such as Tsuyoshi Arai and Takao Horiguchi. These partnerships have contributed to the advancement of his projects and the successful implementation of his inventions.

Conclusion

Yoshikatsu Fujii's contributions to the field of magnetic disk drives demonstrate his innovative spirit and technical expertise. His patents reflect a commitment to improving technology and enhancing user experience in data storage solutions.

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]