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For the Inventor, By the Inventor

Hitachi, Japan

Masaaki Sano

This inventor holds 17 USPTO granted patents, primarily in Thin Film Magnetic Heads. Top assignee: Hitachi, Ltd.. Active years: 1986-2003.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Masaaki Sano. Retrieved from https://idiyas.com/inventor/masaaki-sano

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

USPTO Granted Patents = 17

% Patents Active = 88.2

Average Co-Inventor Count = 7.8

ph-index = 9

Forward Citations = 166(Granted Patents)


Company Filing History:

goldMedal17 out of 42,740 
 
Hitachi, Ltd.
 patents

Years Active: 1986-2003

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Areas of Expertise:
Magnetic Disk Apparatus
Thin Film Magnetic Head
Magnetoresistive Element
Electroplated Thin Film
Ni-Fe Alloy
Crystal Grain Size
Magnetic Membrane Layers
Quarternary Amorphous Alloy
Magnetic Storage System
Magnetic Core
Co-Ni-Fe Alloy
Fabrication Process
17 patents (USPTO):Explore Patents
1. 6661606 - Magnetic disk apparatus with magnetic head having upper and lower magnetic cores of an electroplated thin film (2003-12-09),
2. 6633465 - Magnetoresistive element (2003-10-14),
3. 6490131 - Thin film magnetic head with electroplated Ni-Fe alloy thin film having small average crystal grain size range (2002-12-03),
4. 6385009 - Thin film magnetic head and assembled construction thereof (2002-05-07),
5. 6262867 - Thin film magnetic head with Ni-Fe alloy thin film (2001-07-17),
6. 6249405 - Magnetic head including magnetoresistive element (2001-06-19),
7. 6125019 - Magnetic head including magnetoresistive element (2000-09-26),
8. 6118628 - Thin film magnetic head with Ni-Fe alloy thin film (2000-09-12),
9. 6034847 - Apparatus and thin film magnetic head with magnetic membrane layers of (2000-03-07),
10. 5933297 - Magnetic storage/read system with read head including magnetoresistive (1999-08-03),
11. 5590008 - Magnetic disc unit having a plurality of magnetic heads which include (1996-12-31),
12. 5214840 - Thin film magnetic head and the method of fabricating the same (1993-06-01),
13. 5051856 - Thin film magnetic head with mixed crystal structures (1991-09-24),
14. 4943883 - Quarternary amorphous magnetic alloy thin film and magnetic head (1990-07-24),
15. 4939610 - Thin film magnetic head having magnetic core including a thin film of (1990-07-03),

Title: The Innovative Contributions of Masaaki Sano

Introduction

Masaaki Sano is a prominent inventor based in Hitachi, Japan. He has made significant contributions to the field of magnetic disk technology, holding a total of 17 patents. His work has been instrumental in advancing the efficiency and functionality of magnetic disk apparatuses.

Latest Patents

One of Masaaki Sano's latest patents is for a magnetic disk apparatus that features a magnetic head with upper and lower magnetic cores made from an electroplated thin film. This innovative apparatus includes a magnetic disk for recording information and a magnetic head that consists of a reproducing head and a recording head. The reproducing head is composed of a lower shield film, a magnetoresistive film, a pair of electrodes, and an upper shield. The recording head includes an upper magnetic core, a lower magnetic core, and a coil situated between the two cores. Notably, the upper and lower magnetic cores are made from an electroplated thin film with an average crystal grain size smaller than 500 Å, utilizing a Ni–Fe alloy with specific weight percentages of nickel and iron.

Another significant patent involves a magnetoresistive element that comprises multiple films, including antiferromagnetic and magnetic films, designed to enhance the performance of magnetic storage devices. This design allows for improved magnetization direction control, which is crucial for the functionality of modern magnetic disk systems.

Career Highlights

Masaaki Sano has dedicated his career to research and development at Hitachi, Ltd. His innovative work has not only contributed to the company's success but has also influenced the broader field of magnetic technology. His patents reflect a deep understanding of materials science and engineering principles, showcasing his expertise in creating advanced magnetic components.

Collaborations

Throughout his career, Masaaki Sano has collaborated with notable colleagues, including Moriaki Fuyama and Katsuya Mitsuoka. These collaborations have fostered a creative environment that has led to groundbreaking advancements in magnetic technology.

Conclusion

Masaaki Sano's contributions to the field of magnetic disk technology are noteworthy and impactful. His innovative patents and collaborative efforts continue to shape the future of 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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