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For the Inventor, By the Inventor

Osaka, Japan

Kazuhiko Shimakawa

This inventor holds 66 USPTO granted patents and 1 published patent application and 2 EPO patents, primarily in Nonvolatile Memory (CPC class G11C). Top assignees: Panasonic Corporation, Panasonic Intellectual Property Management Co., Ltd., Matsushita Electric Industrial Co., Ltd.. Active years: 1999-2017.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Kazuhiko Shimakawa. Retrieved from https://idiyas.com/inventor/kazuhiko-shimakawa

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

USPTO Granted Patents = 66 

% Patents Active = 84.8


Average Co-Inventor Count = 3.1

ph-index = 14

Forward Citations = 788(Granted Patents)

Forward Citations (Not Self Cited) = 742(Dec 10, 2025)


Inventors with similar research interests:


Company Filing History:

goldMedal45 out of 16,454 
 
Panasonic Corporation
 patents
silverMedal17 out of 13,338 
 
Panasonic Intellectual Property Management Co., Ltd.
 patents
bronzeMedal3 out of 27,375 
 
Matsushita Electric Industrial Co., Ltd.
 patents
4. 1 out of 1 
 
Panasonic Corporaion
 patent

Years Active: 1999-2017

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Areas of Expertise:
Nonvolatile Memory Device
Variable Resistance
Memory Element
Writing Method
Cross Point
Semiconductor
Storage Device
Manufacturing Method
Resistance Change
Read Method
Programming Method
Inspection Method
66 patents (USPTO):Explore Patents
1. 9595563 - Nonvolatile memory device (2017-03-14),
2. 9484090 - Read and write methods for a resistance change non-volatile memory device (2016-11-01),
3. 9378817 - Variable resistance nonvolatile memory element writing method and variable resistance nonvolatile memory device (2016-06-28),
4. 9336881 - Variable resistance nonvolatile memory device including a variable resistance layer that changes reversibly between a low resistance state and a high resistance state according to an applied electrical signal (2016-05-10),
5. 9251896 - Variable resistance nonvolatile memory device and method for writing into the same (2016-02-02),
6. 9236381 - Nonvolatile memory element, nonvolatile memory apparatus, nonvolatile semiconductor apparatus, and method of manufacturing nonvolatile memory element (2016-01-12),
7. 9202565 - Write method for writing to variable resistance nonvolatile memory element and variable resistance nonvolatile memory device (2015-12-01),
8. 9105332 - Variable resistance nonvolatile memory device (2015-08-11),
9. 9087581 - Cross point variable resistance nonvolatile memory device and method of writing thereby (2015-07-21),
10. 9082515 - Variable resistance nonvolatile memory device and driving method of variable resistance nonvolatile memory device (2015-07-14),
11. 9064573 - Writing method of variable resistance non-volatile memory element and variable resistance non-volatile memory device (2015-06-23),
12. 9053788 - Cross-point variable resistance nonvolatile memory device (2015-06-09),
13. 9053787 - Crosspoint nonvolatile memory device and method of driving the same (2015-06-09),
14. 9001557 - Variable resistance nonvolatile memory element writing method and variable resistance nonvolatile memory device (2015-04-07),
15. 8982603 - Cross point variable resistance nonvolatile memory device and method of reading thereby (2015-03-17),

Title: Kazuhiko Shimakawa: A Pioneer in Nonvolatile Memory Technologies

Introduction: Kazuhiko Shimakawa, based in Osaka, Japan, is an influential inventor known for his significant contributions to the field of nonvolatile memory devices. With a remarkable portfolio of 66 patents, Shimakawa has consistently pushed the boundaries of memory technology through innovative designs and practical implementations.

Latest Patents: Among his latest patents, one notable invention is a nonvolatile memory device that comprises a pair of first wirings extending in a first direction and a second wiring crossing this direction. Additionally, it features a pair of third wirings extending in the second direction, paired with a fourth wiring positioned between the third wirings. The device includes four resistance-change elements adjacent to the intersecting areas of the wirings, as well as a first contact plug positioned at the intersection of two diagonals of a virtual tetragon defined by these elements. Furthermore, Shimakawa's patent details read and write methods for a resistance change non-volatile memory device, incorporating a selection circuit for memory cell selection and a read circuit for assessing the resistance state of elements in the chosen memory cell.

Career Highlights: Kazuhiko Shimakawa's career includes significant tenures at reputable companies, such as Panasonic Corporation and Panasonic Intellectual Property Management Co., Ltd. His work at these institutions has allowed him to develop groundbreaking technologies that have had a lasting impact on the electronics and memory storage industries.

Collaborations: Throughout his career, Shimakawa has collaborated with outstanding professionals, including Ryotaro Azuma and Ken Kawai. These partnerships have facilitated knowledge exchange and fostered innovative approaches towards advancing memory technology.

Conclusion: Kazuhiko Shimakawa stands out as a prolific inventor in the field of nonvolatile memory devices. His extensive patent portfolio, combined with valuable collaborations and experiences at top technology companies, underscores his significant role in driving innovation in this critical area of technology. With each new invention, Shimakawa continues to shape the future of memory devices, ensuring that they meet the evolving demands of modern technology.

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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