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For the Inventor, By the Inventor

Yamato, Japan

Toshio Kato

This inventor holds 5 USPTO granted patents. Top assignee: Victor Company of Japan, Limited. Active years: 1985-1993.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Toshio Kato. Retrieved from https://idiyas.com/inventor/toshio-kato-mc3i4h7r

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

Calculating rank
USPTO Granted Patents = 5

% Patents Active = 100.0

Average Co-Inventor Count = 3.4

ph-index = 5

Forward Citations = 38(Granted Patents)


Company Filing History:

goldMedal5 out of 2,887 
 
Victor Company of Japan, Limited
 patents

Years Active: 1985-1993

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5 patents (USPTO):Explore Patents
1. 5250338 - Magnetic recording medium (1993-10-05),
2. 4753852 - Magnetic recording medium comprising a magnetic Co-Ni-Cr alloy thin layer (1988-06-28),
3. 4664976 - Magnetic recording medium comprising a protective carbon nitride layer (1987-05-12),
4. 4587178 - Magnetic recording medium (1986-05-06),
5. 4517257 - Recording media comprising vertical magnetization layers essentially (1985-05-14),

Title: Innovations of Toshio Kato in Magnetic Recording Technology

Introduction

Toshio Kato is a prominent inventor based in Yamato, Japan, known for his significant contributions to the field of magnetic recording technology. With a total of 5 patents to his name, Kato has made strides in enhancing the performance and reliability of magnetic recording media.

Latest Patents

Kato's latest patents include a novel magnetic recording medium that features a non-ferromagnetic substrate with two types of defects or irregularities. These are formed along a circumferential direction with varying center line average roughnesses. The medium consists of a non-ferromagnetic metal film and a Co alloy ferromagnetic film, which are deposited by sputtering. The ferromagnetic film is designed to have a crystal structure where the (200) plane is parallel to the substrate surface, ensuring that the C axis is oriented toward the circumferential direction. Additionally, Kato has developed a method for fabricating this medium, which involves specific distances between the substrate and the targets during the sputtering process, as well as heating the substrate to temperatures between 150°C and 300°C.

Another notable patent involves a magnetic recording medium that comprises a magnetic Co-Ni-Cr alloy thin layer. This medium is designed for high-density recording and includes a non-magnetic substrate, a Cr undercoat, and a magnetic Ni-Cr-Co alloy thin layer. The thin layer has a thickness ranging from 400 to 1200 angstroms and a Cr content of 3 to 17 atomic percent, which significantly improves the magnetic characteristics and corrosion resistance of the medium.

Career Highlights

Kato is currently employed at the Victor Company of Japan, Limited, where he continues to innovate in the field of magnetic recording technology. His work has been instrumental in advancing the capabilities of recording media, making them more efficient and reliable for various applications.

Collaborations

Throughout his career, Kato has collaborated with notable colleagues, including Akihiro Kimura and Toshikazu Nishihara. These collaborations have contributed to the development of cutting-edge technologies in the industry.

Conclusion

Toshio Kato's contributions to magnetic recording technology have established him as a key figure in the field. His innovative patents and ongoing work at the Victor Company of Japan, Limited, continue to shape the

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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