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For the Inventor, By the Inventor

Tsukuba, Japan

Kunio Mizushima

This inventor holds 8 USPTO granted patents. Top assignee: Hitachi Maxell, Limited. Active years: 1980-1996.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Kunio Mizushima. Retrieved from https://idiyas.com/inventor/kunio-mizushima

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

USPTO Granted Patents = 8

% Patents Active = 100.0

Average Co-Inventor Count = 4.1

ph-index = 6

Forward Citations = 101(Granted Patents)


Location History:

  • Takatsuki, JP (1980)
  • Toride, JP (1985 - 1987)
  • Ibaraki, JP (1987 - 1990)
  • Tsukuba, JP (1989 - 1996)

Company Filing History:

goldMedal8 out of 1,112 
 
Hitachi Maxell, Limited
 patents

Years Active: 1980-1996

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8 patents (USPTO):Explore Patents
1. 5587860 - Magnetic disc cartridge including a magnetic disc having a cleaning (1996-12-24),
2. 4897752 - Disk cartridge (1990-01-30),
3. 4895758 - Magnetic recording medium (1990-01-23),
4. 4828925 - Magnetic disc (1989-05-09),
5. 4709816 - Recording disc cartridge (1987-12-01),
6. 4695910 - Recording disc cartridge having an improved hub assembly (1987-09-22),
7. 4522885 - Magnetic recording medium (1985-06-11),
8. 4223361 - Magnetic recording medium (1980-09-16),

Title: Kunio Mizushima: Innovator in Magnetic Disc Technology

Introduction

Kunio Mizushima is a prominent inventor based in Tsukuba, Japan. He has made significant contributions to the field of magnetic disc technology, holding a total of 8 patents. His work has been instrumental in advancing the reliability and durability of magnetic disc cartridges.

Latest Patents

Mizushima's latest patents include innovative designs for magnetic disc cartridges. One notable patent describes a magnetic disc cartridge that features a cleaning sheet secured within the cartridge case. This design ensures that the magnetic disc, which contains a ferromagnetic metal powder and a fatty acid ester, maintains its durability and operates with minimal errors. Another patent focuses on a disk cartridge that incorporates a cleaning sheet made from a mixed fabric of acrylic and rayon fibers, enhancing the cartridge's handling characteristics.

Career Highlights

Kunio Mizushima has had a successful career at Hitachi Maxell, Limited, where he has been able to apply his expertise in magnetic disc technology. His inventions have not only improved product performance but have also set new standards in the industry.

Collaborations

Mizushima has collaborated with notable colleagues such as Akito Sakemoto and Akira Miyake. Their combined efforts have contributed to the development of advanced technologies in the field of magnetic storage.

Conclusion

Kunio Mizushima's innovative work in magnetic disc technology has made a lasting impact on the industry. His patents reflect a commitment to enhancing the performance and reliability of magnetic disc cartridges.

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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