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For the Inventor, By the Inventor

Kokubunji, Japan

Chiaki Ishikawa

This inventor holds 16 USPTO granted patents, primarily in Magnetic Recording Technology. Top assignees: Hitachi, Ltd., Hitachi Global Storage Technologies Japan, Ltd., Hitachi Global Storage Technologies. Active years: 1998-2007.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Chiaki Ishikawa. Retrieved from https://idiyas.com/inventor/chiaki-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 = 16

% Patents Active = 50.0

Average Co-Inventor Count = 4.5

ph-index = 7

Forward Citations = 209(Granted Patents)


Location History:

  • Kodaira, JP (1998 - 2005)
  • Kokubunji, JP (2001 - 2007)
  • Fujisawa, JP (2007)

Company Filing History:

goldMedal12 out of 42,752 
 
Hitachi, Ltd.
 patents
silverMedal3 out of 227 
 
Hitachi Global Storage Technologies Japan, Ltd.
 patents
bronzeMedal1 out of 52 
 
Hitachi Global Storage Technologies
 patents

Years Active: 1998-2007

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Areas of Expertise:
Magnetoresistive Head
Magnetic Recording
Thin-Film Head
Giant Magnetoresistive Sensor
High Density Recording
Magnetic Shield Layers
Focused Ion Beam Etching
Magnetic Recording Apparatus
Track Width
Magnetization Film Thickness
Perpendicular Magnetic Head
Side Reading
16 patents (USPTO):Explore Patents
1. 7206175 - Magnetoresistive head having defined relationships between the tract width and magnetization film thickness product to permit no hysteresis in the transfer curve (2007-04-17),
2. 7158351 - Magnetic recording and reproducing head restraining a side reading (2007-01-02),
3. 7116534 - Magnetoresistive head (2006-10-03),
4. 6967823 - Magnetic recording head (2005-11-22),
5. 6839200 - Combination perpendicular magnetic head having shield material formed at both ends of an upper pole of a write element (2005-01-04),
6. 6721148 - Magnetoresistive sensor, thin-film read/write head, and magnetic recording apparatus using the sensor (2004-04-13),
7. 6665141 - Magnetic head having track width defined by trench portions filled with magnetic shield material (2003-12-16),
8. 6643105 - Magnetic head having magnetic shield layers (2003-11-04),
9. 6538844 - Method of fabricating a magnetic head by focused ion beam etching (2003-03-25),
10. 6456466 - Magnetic head with shield layer having discontinuous multi-layer or mixed layer and magnetic recording apparatus utilizing the magnetic head (2002-09-24),
11. 6396734 - Giant magnetoresistive sensor, thin-film read/write head and magnetic recording apparatus using the sensor (2002-05-28),
12. 6307707 - Narrow track thin film head including magnetic poles machined by focused ion beam etching (2001-10-23),
13. 6278578 - Narrow track thin film head having a focused ion beam etched air bearing surface (2001-08-21),
14. 6243288 - Giant magnetoresistive sensor, thin-film read/write head and magnetic recording apparatus using the sensor (2001-06-05),
15. 6111723 - Narrow track thin film magnetic head suitable for high density recording (2000-08-29),

Title: Chiaki Ishikawa: Innovator in Magnetoresistive Technology

Introduction

Chiaki Ishikawa is a prominent inventor based in Kokubunji, Japan. She has made significant contributions to the field of magnetoresistive technology, holding a total of 16 patents. Her work has advanced the understanding and application of magnetic recording and reproducing heads.

Latest Patents

One of her latest patents is titled "Magnetoresistive head having defined relationships between the tract width and magnetization film thickness product to permit no hysteresis in the transfer curve." This invention addresses the control of magnetic domains in narrow magnetoresistive heads, allowing for a smaller magnetization film thickness product than previously anticipated. By defining this product within a specific range, her invention achieves a magnetic head with higher and more stable output, free from hysteresis and output fluctuations. Another notable patent is "Magnetic recording and reproducing head restraining a side reading." This patent describes a magnetic recording head that includes an upper shield layer, a lower shield layer, and a magnetoresistive film, designed to minimize side reading effects, thereby enhancing the performance of magnetic recording devices.

Career Highlights

Chiaki has worked with notable companies such as Hitachi, Ltd. and Hitachi Global Storage Technologies Japan, Ltd. Her experience in these organizations has allowed her to develop and refine her innovative ideas in magnetoresistive technology.

Collaborations

Throughout her career, Chiaki has collaborated with esteemed colleagues, including Hisashi Takano and Naoki Koyama. These partnerships have contributed to her success and the advancement of her inventions.

Conclusion

Chiaki Ishikawa's contributions to magnetoresistive technology have made her a key figure in the field. Her innovative patents and collaborations reflect her dedication to advancing technology in magnetic recording.

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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