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For the Inventor, By the Inventor

Tachikawa, Japan

Sumie Ishikawa

This inventor holds 1 USPTO granted patent. Top assignee: Hitachi, Ltd.. Active years: 1990.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Sumie Ishikawa. Retrieved from https://idiyas.com/inventor/sumie-ishikawa

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

Calculating rank
USPTO Granted Patents = 1

% Patents Active = 100.0

Average Co-Inventor Count = 3.0

ph-index = 1

Forward Citations = 15(Granted Patents)


Company Filing History:

goldMedal1 out of 42,752 
 
Hitachi, Ltd.
 patents

Years Active: 1990

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1 patent (USPTO):Explore Patents
1. D306578 - Optical disk drive unit for electronic computer (1990-03-13),

Title: Sumie Ishikawa: Inventor in Optical Disk Drive Technology

Introduction

Sumie Ishikawa is an inventor associated with Tachikawa, Japan, and Hitachi, Ltd. Her recorded patent work concerns optical disk drive technology for electronic computers.

Latest Patents

Ishikawa is credited with 1 patent: “Optical Disk Drive Unit for Electronic Computer.” The invention relates to a drive unit designed for use with an electronic computer.

Career Highlights

Ishikawa’s listed patent reflects her contribution to the development of computer storage and optical disk drive technology at Hitachi, Ltd.

Collaborations

Her listed coworkers include Mamoru Sumita and Kenji Yokoi, who are also associated with the patent.

Conclusion

Sumie Ishikawa’s recorded invention highlights her work on optical disk drive technology for electronic computers.

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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