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For the Inventor, By the Inventor

Kawasaki, Japan

Masahito Iwatsubo

This inventor holds 7 USPTO granted patents. Top assignee: Fujitsu Corporation. Active years: 1989-1999.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Masahito Iwatsubo. Retrieved from https://idiyas.com/inventor/masahito-iwatsubo

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 = 100.0

Average Co-Inventor Count = 2.5

ph-index = 6

Forward Citations = 110(Granted Patents)


Company Filing History:

goldMedal7 out of 39,374 
 
Fujitsu Corporation
 patents

Years Active: 1989-1999

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7 patents (USPTO):Explore Patents
1. 6002538 - PRML regenerating apparatus having adjusted slice levels (1999-12-14),
2. 5847891 - PRML regenerating apparatus (1998-12-08),
3. 5570269 - Magnetic disk module (1996-10-29),
4. 5293498 - Arrangement of designation of drive element number using mother boards (1994-03-08),
5. 4978902 - Synchronous rotation control system of magnetically recording disk (1990-12-18),
6. 4967293 - Multi-positioner magnetic disk storage apparatus having means for (1990-10-30),
7. 4879498 - DC motor drive system for reducing start-up current (1989-11-07),

Title: Masahito Iwatsubo: Innovator in PRML Regenerating Technology

Introduction

Masahito Iwatsubo is a prominent inventor based in Kawasaki, Japan. He has made significant contributions to the field of signal processing, particularly in the development of PRML (Partial Response Maximum Likelihood) regenerating apparatuses. With a total of 7 patents to his name, Iwatsubo continues to push the boundaries of technology.

Latest Patents

Iwatsubo's latest patents include innovative designs for PRML regenerating apparatuses. One notable patent describes a PRML regenerating apparatus that enhances the regeneration of signals read by a head from a storage medium. This apparatus features a waveform equalizing circuit that equalizes the read signal and a maximum-likelihood decoder that decodes the signal after comparing it with adjustable upper and lower slice levels. The design allows for variable adjustment of the distance between these slice levels based on equalization characteristics, improving the accuracy of signal processing.

Career Highlights

Iwatsubo has had a successful career at Fujitsu Corporation, where he has been instrumental in advancing technologies related to data storage and signal processing. His work has not only contributed to the company's innovations but has also had a lasting impact on the industry as a whole.

Collaborations

Throughout his career, Iwatsubo has collaborated with notable colleagues, including Hideki Ohmori and Tooru Shinohara. These collaborations have fostered a creative environment that has led to the development of groundbreaking technologies.

Conclusion

Masahito Iwatsubo's contributions to the field of signal processing through his innovative PRML regenerating apparatuses highlight his role as a leading inventor. His work continues to influence advancements in technology and 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]
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