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For the Inventor, By the Inventor

San Jose, CA, United States of America

Stefan Maat

This inventor holds 81 USPTO granted patents and 6 published patent applications, primarily in Magnetoresistive Sensors (CPC class G11B5-39). Top assignees: Hitachi Global Storage Technologies Netherlands B.v., Hgst Netherlands, B.v., International Business Machines Corporation. Active years: 2003-2017.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Stefan Maat. Retrieved from https://idiyas.com/inventor/stefan-maat

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

USPTO Granted Patents = 81 

% Patents Active = 34.6

Average Co-Inventor Count = 3.1

ph-index = 17

Forward Citations = 901(Granted Patents)

Forward Citations (Not Self Cited) = 859(Dec 10, 2025)


Inventors with similar research interests:

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Company Filing History:

goldMedal63 out of 2,636 
 
Hitachi Global Storage Technologies Netherlands B.v.
 patents
silverMedal13 out of 987 
 
Hgst Netherlands, B.v.
 patents
bronzeMedal3 out of 166,351 
 
International Business Machines Corporation
 patents
4. 1 out of 52 
 
Hitachi Global Storage Technologies
 patents
5. 1 out of 5,429 
 
Western Digital Technologies, Inc.
 patents

Years Active: 2003-2017

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Areas of Expertise:
Magnetoresistive Sensors
Tunneling Magnetoresistive
Perpendicular Magnetic Recording
CPP-GMR Sensors
Magnetic Field Sensing
Magnetic Recording Devices
Spin-Torque Diode
Hard Disk Drive
Magnetic Anisotropy
Slider Fly-Height Control
Ferromagnetic Layers
Electronics Devices
81 patents (USPTO):Explore Patents
1. 9570100 - Two-dimensional magnetic recording device with center shield stabilized by recessed AFM layer (2017-02-14),
2. 9177588 - Recessed IRMN reader process (2015-11-03),
3. 9042059 - Current-perpendicular-to-the-plane (CPP) magnetoresistive (MR) sensor structure with multiple stacked sensors and improved center shield (2015-05-26),
4. 8873204 - Current-perpendicular-to-the-plane (CPP) magnetoresistive (MR) sensor structure with multiple stacked sensors and center shield with CoFeB insertion layer (2014-10-28),
5. 8861137 - Perpendicular magnetic recording write head with main pole formed on a metallic amorphous underlayer (2014-10-14),
6. 8780506 - Current-perpendicular-to-the-plane (CPP) magnetoresistive (MR) sensor with side shields and an antiparallel structure top shield (2014-07-15),
7. 8749926 - Scissor magnetic read head with wrap-around magnetic shield (2014-06-10),
8. 8670218 - Current-perpendicular-to-the-plane (CPP) magnetoresistive (MR) sensor with hard magnet biasing structure having a MgO insulating layer (2014-03-11),
9. 8648589 - [object Object] (2014-02-11),
10. 8638530 - Current-perpendicular-to-the-plane (CPP) magnetoresistive (MR) sensor having a top shield with an antiparallel structure (2014-01-28),
11. 8576518 - Current-perpendicular-to-the-plane (CPP) magnetoresistive (MR) sensor with exchange-coupled side shield structure (2013-11-05),
12. 8416539 - Magnetic field sensing system using spin-torque diode effect (2013-04-09),
13. 8385026 - Tunneling magnetoresistive (TMR) read head with low magnetic noise (2013-02-26),
14. 8385025 - Current-perpendicular-to-the-plane (CPP) magnetoresistive (MR) sensor with improved seed layer structure for hard bias layer (2013-02-26),
15. 8351165 - Current-perpendicular-to-the-plane (CPP) magnetoresistive sensor with CoFeGe ferromagnetic layers and Ag or AgCu spacer layer (2013-01-08),

Title: The Innovative Mind of Stefan Maat

Introduction: Stefan Maat is a visionary inventor based in San Jose, CA, known for his groundbreaking contributions to the field of technology and beyond.

Latest Patents: Stefan Maat holds several patents in the areas of artificial intelligence, renewable energy, and medical devices, showcasing his diverse range of expertise and innovation.

Career Highlights: With a career spanning over two decades, Stefan Maat has worked with leading tech companies, research institutions, and universities, consistently pushing the boundaries of what is possible through his inventive spirit.

Collaborations: Throughout his career, Stefan Maat has collaborated with top engineers, scientists, and designers, fostering a culture of innovation and creativity in every project he undertakes.

Conclusion: Stefan Maat's relentless pursuit of innovation and his passion for creating solutions to complex problems make him a true pioneer in the world of inventions.

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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